The attacking midfielder only joined Rovers in the summer from City, where she made her competitive debut at the age of 15.
Young scored five goals in 12 appearances for Rovers during the first half of the campaign, including a brace in the 2-2 draw away to Wolves in September and another double in the Lancashire Cup tie at home to Bolton.
Manchester City will compete in the expanded Women's Super League for the first time in 2014 and have already added England internationals Jill Scott, Karen Bardsley, Toni Duggan and Steph Houghton, as well as former Rovers winger Steph Marsh, to their ranks.
Rovers Ladies interim manager Gemma Donnelly said: “Dan made an immediate impact in the squad.
“She has a great character, which was reflected by the camaraderie in the group.
“Whilst she was here for just a short time, we were under no illusion that she would be returning to Manchester City.
“We are disappointed that she has decided to go back, but we have left the door open for any potential future return, because she’ll be a tremendous asset to any team.
“We wish her the best of luck and both myself and AJ (Amanda Goodwin) will be keeping a close eye on Manchester City, and in particular Dan and Steph, and we hope they can do themselves justice in the Women’s Super League.”