She is an active and well-known member of video game fandom who participates in cosplay subculture, wearing costumes and fashion accessories at various conventions and events to represent specific fictional characters.

[1] Her responsibilities include managing the brand presence of Crystal Dynamics' intellectual property on social media, engaging with players on online platforms and at events worldwide, and assuming the role of a studio spokesperson.

[1] From April 2014 to September 2014, Marie worked at the Dublin branch of Riot Games after accepting a job offer from a recruiter, where she was responsible for promoting and developing programs to build the League of Legends fan community in Europe.

[19] During her teenage years, she developed a keen interest to work for Game Informer magazine after discovering that they are based in the same city as her, and advertised her intent on her Myspace profile.

Marie is outspoken about her experiences with incidents of gender discrimination and sexual harassment, and has documented anecdotes from her professional life on social media platforms like her personal Tumblr blog.

[21][22] Her public disclosure about her negative experiences at Riot Games' Dublin branch, including being subjected to inappropriate inquiries and comments concerning her gender, contributed towards drawing media attention to the controversy surrounding the company's workplace culture issues.

[23][24][22] She was initially reluctant to go public with a detailed account of her experiences due to a fear of backlash and harassment, but felt encouraged to proceed after she witnessed the reticence to believe the women who came forward.