A BIG thank you for rescuing! I am surely grateful for people like you! Has she been tested for thyroid? If she was seen by the vet & her tests came out negative then it probably has something to do with her previous home. Possibly mal-nurished or allergies. If she is having no other symptoms I would just put her on a great quality food & watch her closely. It sounds like it should clear up within a few months. The best of luck.