She also had roles in the films Scott Pilgrim vs. the World (2010), The Perks of Being a Wallflower (2012), and The DUFF (2015), the latter earning her a Teen Choice Award nomination.

Whitman has also worked as a voice actor in film and television, including Little Suzy in Johnny Bravo (1997–2004), Shanti in The Jungle Book 2 (2003), Katara in the Nickelodeon series Avatar: The Last Airbender (2005–2008), Rose / Huntsgirl in American Dragon: Jake Long (2005–2007), Tinker Bell in the eponymous film series (2008–2015), Cassie Sandsmark / Wonder Girl in Young Justice (2012–2022), April O'Neil in Teenage Mutant Ninja Turtles (2012–2017), Amity Blight in The Owl House (2020–2023), Annie in Skull Island (2023–present), and reprising her Scott Pilgrim role as Roxie Richter in Scott Pilgrim Takes Off (2023).

Whitman played the role of Chloe Madison on JAG In several guest appearances from 1998 to 2001 before starring in the Fox Family series State of Grace.

Whitman appeared in the 2006 series Thief for FX Networks, playing the stepdaughter of Nick Atwater (Andre Braugher).

She also appeared on Desperate Housewives in the episode "Nice She Ain't" as Sarah, an unscrupulous friend of Julie Mayer (Andrea Bowen).

Whitman also had a recurring role on Chicago Hope (1994–2000), playing the daughter of Dr. Kate Austin (Christine Lahti), in the series' later years.

Whitman was initially cast in the 2007 series remake of Bionic Woman, playing the deaf younger sister of the title character.

[12] As part of a deal to promote the production of the first Tinker Bell film, the UK's speaking clock started to use her voice at 0100GMT on October 26, 2008.

Christmas,[19] and has sung guest vocals on a number of tracks from indie-punk band Fake Problems' 2010 album Real Ghosts Caught on Tape.

[20] Whitman has also been featured on her show Parenthood in the song "Gardenia" on the season two episode "The Booth Job" along with Landon Pigg.

"[29] In an interview with Bello Mag, Whitman explains that the entertainment industry constantly tells actors what they are "not" and felt her choosing of these roles was her "trying to communicate to everyone" who may go through similar situations, that it's okay to be who they are.

"[31][32] In 2018, Whitman was cast alongside Retta and her Tinker Bell co-star Christina Hendricks on the NBC dramedy Good Girls.