Hi and welcome from me too, I'm new also but already getting addicted to this site!
I have a 5 year old rescue Yorkie who also had lived in bad conditions, her skin was all thin with no elastacity to it and her coat was thin and bald in places so the vet advised a balanced diet, a few drops of olive oil on her food and Vitamin E cream rubbed on her skin.
I'm sure your lucky baby will be fine now she has you to love her.