Sonia Marshall worked at Mike Baldwin's factory, Underworld, from 2003 to 2005. She had a brief romance with resident Martin Platt, their relationship ended and she decided to become a Red Coat at a holiday camp and left the Street for good.
First and last lines
"We've got bills to pay." (First line, to Mike Baldwin)
"Have a nice life you sex god!" (Final line, to Danny Baldwin)