In Christmas 2008 Nick Cotton, played by John Altman returned to EastEnders. After spending time in Walsall, Nick would return with an eight-year-old daughter, Dotty. The part of Dotty was cast to Conlin, who was 7 at the time.
Speaking of her casting, Conlin said, "I"m really excited about it because I have always wanted to be in EastEnders." Conlin was considered too old for the part of Tiffany Dean which she a previously auditioned for but she succeeded in impressing the producers, who offered her the role of Dotty instead.
The part of Tiffany went to Maisie Smith. Dotty was originally eleven years old, but on Conlin"s casting, they changed her age to seven.
Introduced as a guest character by Santer she made her first appearance on 26 December 2008. She started to appear more frequently, becoming a recurring character, until Dotty later left on 23 February 2010.