I doubt it. If she was starved, she might have a skinny butt. Also, mine goes thru periods of not eating for MONTHS and then suddenly EATING everything in site !! Not to worry, she prolly just fine and being like a typical rosea.
Rosea are know for acting weird. Just make sure there is a water dish. If she keeps eat let her she will stop when she has had enough. Mine has a huge abdomen and she will still eat every time I put food in the cage. There is also the possiblity that the pet store just didn't feed her enough. When did you get her? She may have molted before and is just trying to get back some weight. All and all I would not worry.