I'd get her in to the vet for a checkup/spayed as soon as possible. She also looks a bit squinty in both pictures and some of the kitty's I've known in the past also got a sort of squinty look when they were not feeling well, so I would be concerned. Any change in behaviour could be a sign something is not quite right. Also I think she may be a bit older. Good luck.
She's very pretty by the way.
