What an improvement! Good job you two!
She sure doesn't seem to have any issues with her legs now so either your splint or her just gaining some strength straightened them right out. From what I see, her legs are straight underneath her, and the bit of walking looked fine.
Does she cry like that when under the heat too? She just looks/sounds cold.
If you were able to get her some chick vitamins, I think that would help get her back up to speed, but otherwise, I'd not feed her anything but the chick crumbles. I know you said she ate a lot of scrambled eggs, and that's a good treat, but it shouldn't be her meal, as whilst those are nutritious, they're also missing many vitamins/minerals that her feed provides. Make sure she's drinking water too.
Great job!