I never use the golf ball look, I had a fat male once that looked like he was preggo. It is possible, keep her seperate from the male for a while, if it is not his litter he may kill them. If she has not had babies in 2 weeks then it is safe to put her in with the male. I have a lot of mice that get fed well so a lot of the time they look like they are preggo, but they are not, I have had no male/female interaction in 2 months, yet half my girls look about like yours.
Good luck with her.