Well, that's good news that there's nothing broken or dislocated! Sounds like maybe she's beginning to heal from whatever the trauma was? I don't know how comfortable you are with handling her, but it would be awesome if you could get her up somehow in a sling. I've used those net things that some cars have in the back of them to hold groceries in place...but there are other things you can use, too. The idea is to get her in a standing position, so her feet/legs are down under her...you know what a Johnny Jump-Up is? Sorta like that. You'll have to raise her feed/water dishes if you can do that. But this is a great way to get her to use that leg/foot, get it some exercise, so it doens't atrophy on her.
For feed, if the vet thought she was old enough for layer feed, you can give her any brand of laying feed. Purina makes one called Layena in both a pelleted and crumble version. I prefer pelleted, because crumbles get wasted more. Just my opinion. I don't know where you are located, but if you can get Buckeye brand where you are, they make a pelleted layer feed that has animal protein in it, and it's overall protein content is higher than Purina's feed. There are other brands that have animal protein in them, as well. If you want to give her some "treats" what have higher protein, you could cook some egg yolks for her, and chop them up. Also, you could give her a few pellets of dry cat food if you have any around; they are high in protein, and I often give them as a treat when my girls are molting to help them through that. She could probably also use some yogurt if you have any. That's got lots of beneficial cultures in it.
Sounds like this girl is fighting to make it, and she picked the RIGHT human to help her! Please keep us posted, & post more pics when you can!!!