Thank for the videos!
I would tape the toes flat, they look a bit curled. She may also have spraddle leg, look at the the article I posted previously, it shows you how to hobble her.
B-vitamins or poultry vitamins that contain B2(Riboflavin) would be good to give for several days as well.
For the butt, give it a clean up and get the poop off. You can put a little coconut oil or vaseline around the vent to help keep it from sticking. Also check the temp of your brooder - pasty butt can be from being too hot or cold. Chicks need one warm spot at 90-95F and let the rest be cool or room temp. Behavior is a good indicator if they are comfortable.