Anderson joined Pyle-based children's Vagabond Theatre at age seven, with the teacher Trevor Harris.
Another influence in her life was drama teacher Roger Burnell at Porthcawl comprehensive school performing with them at The Grand Pavilion until age 13 in productions including starring as Annie in Annie, Juliet in Romeo and Juliet, Cecily in The Importance of Being Earnest, and Lily in Under Milk Wood.
There, she worked on films including Sony Pictures' Detention, Portal, Three Days Blind, Float, Big Top and Halloween Night.
She played Marie in the Torchwood episode "Reset", and had a small role on Prison Break.
In July 2011, Anderson featured in the second episode of the eighth season of Curb Your Enthusiasm, playing the role of Richard Lewis' new girlfriend, Stella.