She's maintained since this started, eating every 3 weeks. I started feeding at 10 days this past week instead of every 3 weeks. I hope that helps her gain strength and put some weight on.
Since there is no sign of stomach trouble or parasites, etc. per stool sample, and that she pounds her meals, I would assume she's not gaining weight because the stress and energy used on shedding is taking the calories she would normally put to weight and putting them to maintain.
I am on hold with the vet currently and will advise on that shortly. Possibly later today after I see them - assuming I get in today.
EDIT: I see the vet at noon tomorrow.