Are both legs going to the front and she's resting on her hocks, or is one leg going front and one back?
For now I would recommend that you give her some B vitamins. You can get a human B complex (regular, not time release), crush up 1/2 a tablet and give her that mixed in a bit of moistened crumbles or pellets daily. Riboflavin deficiency (B2) in particular can cause hock sitting and curled toes. Thiamine (B1) deficiency can also cause some neuro-muscular issues.
If one leg is front and one leg is back, that is a symptom of Marek's disease, and that would need to be considered. I would do the vitamins first and see if you get any improvement, vitamin deficiencies are not uncommon and many times reversable if treated soon enough.