Beet pulp has helped my hard keeper. I mix a little rice bran oil with it, so she puts on weight, has a healthy GI tract, and her coat and skin look great. We had the same issue, the vet came out to float her teeth, and he said they didn't look bad enough to float. She's been dewormed plenty, she's just an old hag and a hard keeper.
I would make sure that it's NOT worms or teeth before you try other things though. If you're trying all sorts of stuff when she has bad teeth, you might as well be throwing money away.
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