Have you put her in the tub in warm water enough to float an move around. She needs to move those legs or she will lose all muscle. Having the water to hold her up may help her be able to exercise and possible even stand with water to help hold her weight. I’d give her 2x day of the liquid B...
I'd get to TSC and get Durvet liquid B complex and start her on it orally or mixed with her peas. you want to be sure she is getting the full 1ml dose a day. If it's a niacin deficiency then the B complex she get her back up and walking. Might take a week but we find mixing niacin in water just...