Hi Stacy, she could also be overgrooming herself for some reason. Some cats start doing this and they lose their fur in patches. She could also be developing food allergies. My cat Storm will loose fur on his ears and surrounding areas because he's allergic to fish. It makes him very itchy and he scratches it until he loses patches of fur. I hope that you'll be able to find out what her problem is and that it's not serious. Please continue to keep us updated about her.

Do you have any pictures of her?