anyone ever rehabilitate a bag of bones of a dog?

[mopinko]

this dog that i got from the pound is the skinniest thing i have ever seen. she was picked up in mid february, either pregnant or already with pups. she did manage to raise them, but they were unable to add an ounce to her. they were feeding her 3 times a day, but all they have to give them is purina.
i have a friend that gets me pet food from a wholesaler, and she gets good stuff. she got me some stuff that is almost a powder, but almost all meat. no corn or anything. she is going to get me some buffalo for her. treats around here means dried lamb lungs. so we are being generous with that, also. the regular food i feed is pretty good, but i think i will get a bag or 2 of abady. not that big on feeding my pets better than the kids, but a it won't hurt for a little while.
she is pretty weak, after the spay yesterday. mostly just lolling on the couch. we are keeping her covered up, and have her crate heavily covered.
she seems to be tolerating the richer food pretty well. her appetite is pretty good. another day or so, when i am sure she can handle it, i will shovel a little more in.
so, any tips?