Dotty Cotton – Wikipedia

Kirsty “Dotty” Cotton is a fictional character from the BBC soap opera EastEnders, played by Molly Conlin from 2008 to 2010 and Milly Zero since 2019. She was introduced on 26 December 2008 as the daughter of established character Nick Cotton (John Altman).Dotty was used as Nick’s partner in crime, as the duo planned to kill her grandmother Dot and inherit the money from her will.

https://en.wikipedia.org/wiki/Dotty_Cotton