This is a little unconventional, but you could try emu oil. Rubbing it on bald spots is said to help the fur regrow (it's certainly working on my cat), and licking it (you'll have no trouble getting her to do that!) gives helpful nutrients to help strengthen delicate skin. Sometimes health food stores have it, or you can order it online.

Love, Columbine (who even put some on her own chin this morning in an attempt to diminish chronic zit grit, and may be rubbing it on her bunions before long...)