Roxie had a completely bald tail (like a rat tail!) and bald spots on the back of her ears as well, when I got her a couple of months ago. Her tail hair has now grown back and her ear baldness is filling in. I think it might have been poor diet because her previous owner was feeding crappy Ol' Roy and now she is on a super premium diet.. I'm sure your little girl's bald spots will fill in
Keep us updated on what your vet says.. I'm so excited for you! Can't wait for more pictures.