Chicken feed would be best for her at
s at least 90% of her diet, although she could have some occasional bits of scrambled egg for a treat. The balanced feed plus vitamins and minerals are important for her development. It sounds like you are very good with helping disabled chickens.
Here are some articles about the various leg bone deformities, varus/valgus deformity, twisted tibia, and others:
https://www.merckvetmanual.com/poultry/disorders-of-the-skeletal-system-in-poultry/noninfectious-skeletal-disorders-in-poultry-broilers#:~:text=Valgus deformation is more...
I agree that looks like a deformity from hatch, and I don’t think there is anything that can be done. She may be able to get around a small area to get food and water, and might lay eggs for you eventually. Here is a local chick who had a similar deformed foot, and students made it a little blue...