[32][33][34] In July 2017, she joined the RADA Youth Company: Acting summer term, training under Trilby James in contemporary text and Shakespeare.

After the play's run, Duncan strongly recommended that she continue acting, directing her to film agents in London where she signed on with A&J Management.

It was not yet decided by the producers that the final book in the series would be split into two parts and once this decision was made, Darcey-Alden was expected to "re-audition over a year later" in December 2009 and "luckily still met the height and role requirements.

"[36] On 25 January 2010, she was called back for a second audition at Pinewood Studios where she met director David Yates and worked with a number of other potentials for the parts of young James Potter, Sirius Black, Severus Snape and Lily Evans.

She subsequently received a screen test with then 13-year-old Benedict Clarke (who would be cast as young Severus Snape) "as well as an associated costume, hair and makeup meeting" at Leavesden Studios, where she met then 21-year-old actor Daniel Radcliffe on her first day.

[48][49] Although Darcey-Alden was tipped for future success by her agents at Enfield, London-based casting and theatrical agency A&J Management, her parents decided to not treat her passion for acting seriously until she was more mature.

When production began, she was not allowed to tell her close friends of her casting in Potter as she left school for Leavesden Studios and Hatfield House to film her scenes.

[54][55] Once location shoots were completed, Darcey-Alden and Clarke joined McIlwain and Gotobed at Leavesden on the set of the Great Hall where the set was divided with one section of the Entrance Hall in ruins for the Battle of Hogwarts sequences; two days of shooting were completed from morning until evening, scheduled a week apart where three hours of school tutoring was provided.

[56] Darcey-Alden mentioned in a LeakyCon 2013 panel session that she worked with Dame Maggie Smith the first half of the day and was quoted, jokingly: "She spoke to me.

[2][58] Darcey-Alden herself later confirmed that she wore contacts in January 2015 when she was a special guest in a Harry Potter celebration at the Riverview Middle School in New Brunswick, Canada.

It was announced on 20 July 2011 via the official A&J Management Twitter that she had been cast in a cameo role in Welcome to the Punch, a British thriller co-starring James McAvoy, Mark Strong and Harry Potter alum Peter Mullan.

[70] Other roles include two short films, Pranks, a children's ghost story following a 12-year-old orphan named Katie confronted by the spirit of her foster mother's dead son and Sam & Isobel, a coming of age tale of two young children brought together within the confines of a woodland through childlike innocence and naivety, although Sam eventually realises that Isobel is not as innocuous as she seems.

Pranks co-starred her real life brother Joseph Darcey-Alden,[71] was shot in four days on location at Cuckmans Farm, St Albans.

[...] Ultimately, this indication of maturity foreshadows who her character truly is, who may appear adorably innocent yet there's an edge of coldness beneath her given how she's not disturbed by many of her careless actions.

"[79] In 2012, she returned to the BBC for the Doctor Who series 7 Christmas special, "The Snowmen" as Francesca Latimer reuniting with real life brother Joseph Darcey-Alden as her on-screen sibling and co-starring alongside Jenna-Louise Coleman and Matt Smith.

[80][81] In the episode, set in London 1892, Francesca "Franny" Latimer and her brother Digby are wards being cared for by their governess Clara Oswin Oswald under the alias "Miss Montague".

Through a series of events, Franny's nightmare manifests under the Great Intelligence's influence, the Ice Governess is destroyed with the help of the Doctor, and Clara tragically succumbs to internal injuries, mourned by the Latimers.

[81] To date, Darcey-Alden is the latest in a line of Harry Potter cast members to have appeared in both Potter and Doctor Who, including David Tennant, Michael Gambon, Helen McCrory, John Cleese, Zoe Wanamaker, Jim Broadbent, Toby Jones, Roger Lloyd Pack, Bill Nighy, Shirley Henderson, Adrian Rawlins, David Bradley, and John Hurt.

[84] The same year, it was confirmed that she would guest star in the second season of Tom Fontana's French-German-Czech historical television drama Borgia: Faith and Fear (not to be confused with Showtime's The Borgias) as Felice della Rovere, on-screen and illegitimate daughter to Dejan Čukić's Cardinal Giuliano della Rovere (better known as Pope Julius II).

[87] Darcey-Alden filmed her scenes in Italy that October over the span of three days, sharing the screen alongside Matt Di'angelo and Mark Ryder.

[91] Although Felice is considered a powerful and influential historical figure, Darcey-Alden's part in the show is reduced to a minimal appearance in the shadow of her powerful father; based on documentation, Felice was married as early as 14 and was widowed shortly after, years before she remarried Gian Giordano Orsini and subsequently became a prominent figure of the Italian Renaissance.

[92] While Darcey-Alden filmed minimal scenes for episodes 11 and 12, they were eventually cut from the final version, yet her name still appears in the credits of the Season 2 DVD (Region 2).

[105] On 6–8 February 2015, she appeared in the KAR: Kids Artistic Revue Long Beach, CA Competition, which took place at Millikan High School.

[106] She additionally performed in the Palos Verdes High School Choreo Show 2015 and returned for 2016, which was held at the James R. Armstrong Theatre in Torrance from 23–24 March.

[107][108] She worked for the first time behind the scenes as a British English dialect coach for Palos Verdes High School's production of Noises Off, performed from 6-8, 12–15 November 2015.

[109][31] She was cast in Palos Verdes High School's production of Joseph and the Amazing Technicolor Dreamcoat, directed by Nicole Thompson as the Female Ensemble which was performed from 15-17, 21–24 April 2016.

In August 2018, she was cast as the recurring character Alice in the British drama action television series Remnants, directed and written by Luke Heaver and Kieran Thomas Peace.

2009-10,[116] Playworld Systems, Nestle, Sodexo, Marks & Spencer, and McCarthy & Stone, and was a front page model for the British children and pre-teen magazine Girl Talk in 2012 and 2013.

[129] She was scheduled to appear as a guest at Gallifrey One 2014, a science fiction and Doctor Who fan convention, which took place 14–16 February at the Los Angeles Airport Marriott.

[132] She and her brother Joseph appeared as guests at the Midwest's Premier Doctor Who event, Chicago TARDIS 2014 from 28–30 November at the Westin Lombard Yorktown Center.