In the same year, she made her first appearance as Mo Harris in the BBC soap opera "EastEnders". Her first scene in the BBC soap opera was with Pam St Clement, who played Pat Butcher. A couple of weeks later, a television critic said that Morse had acted like "a lump of cardboard". Recalling the article, Morse replied: "I daresay he was right! I was bloody petrified." She admitted that it was only three years later that she started to feel comfortable on set. Morse temporarily left "EastEnders" in January 2016, after appearing on a recurring basis since July 2012.