That same day, she found out she got the part. Her last audition was a chemistry read with Louis Hynes in LA, and as he had a British accent, she was concerned that she wasn't going to get the part or be made to don a British accent. Weissman auditioned for Violet Baudelaire several times, having previously worked with Barry Sonnenfeld on Nine Lives. That's the big message of the show, that kids need to speak up and make sure our voices are heard. In 2016, Weissman appeared in the film Thirsty Girl, and had the significant role of Rebecca Brand in the comedy film Nine Lives, also starring Kevin Spacey and Jennifer Garner, which was released in end of July, 2016. Television's superhero series Supergirl as a young Kara Zor-El, played as an adult by Melissa Benoist. In 2015, Weissman appeared in the CBS and Warner Bros. She made her film debut playing the role of a young April O'Neil in the science fiction action comedy film Teenage Mutant Ninja Turtles, the role played as an adult by Megan Fox, in 2014.
As an actress, she has appeared in commercials for ACT mouthwash, Maybelline, Purell, and My Little Pony. She has appeared in major designers and brands like Calvin Klein, Ralph Lauren, Levi's, Benetton, DKNY, H&M, among many others. She started her career as a model at the age of eight, following in the footsteps of her mother whose agency discovered her. Weissman is a New York City-based model and actress.