She appears in the opening scene of the 2012 series Emily Owens, M.D., playing a girl named Abbey who initially ridicules the main character, but later comes to admire her. Following other guest parts, and additional work in shorts, Stone won her first role as a series regular in the TV show The Killing, which she appeared on in 2013. In an interview with The Huffington Post, she described winning the part as "one of the happiest moments of my life". In the series, Stone plays a teen prostitute who becomes caught in a love triange with her boyfriend and another girl. "It's really raw, but it's the kind of thing that's happening and it's important to put a light to it," Stone said. "There wasn't anything explicit or unnecessary and they shot it in a way that's supportive to the story. My mom and I saw it similarly—this is an important story that needs to be told." While discussing the character's effect on her, Stone noted, "I really admire that no matter what, she's believing and hoping and having faith in a better Future. That's something that I've taken away from this whole experience of playing her, is that no matter what, you can still always have hope. That's something I've learned from her."