If you can feel her ribs when running your hand over her body, but not SEE them, then sounds like she's pretty okay. Please bear in mind it is hard for any of us to give advice about a dog's weight without seeing the dog - so that is for you to judge.
Omega oils are imperative for a dog to have a shiny, healthy coat, and more importantly, healthy skin, which reading through your different threads - I get the indication her skin is FAR from healthy.
If you can't give her some fish or sardines at least once a wekk (I'd be doing it daily myself ATM) talk to your vet. They will be able to give you a bottle of special omega oil mixture which you can put on her food each day. Amazing how quick the difference in skin will show!