Annamarie first appeared in 2005 in Amateur, as Jeffrey Christopher Todd's little sister. She then appeared in iCarly as Shannon, the girl that Gibby likes but has a crush on Freddie. In 2009, she is appeared in Southland as Kimmy Salinger.
As of 2014, Kenoyer portrays Becca in The Fosters, a girl who is part of the group of foster girls who live on a home named Girls United. A spin-off web series of The Fosters called The Fosters: Girls United will be released on February 3, 2014, where she will be part of the main cast. The five-part series will focus on the girls who are part of the home Girls United.