Also, try to handle her as little as possible, aside from helping her right herself. Two days ago mine was laying on its back and holding its leg out, now she just seems kinda tired but she's walking on it.
Im super new to this, but my week old blue silkie was doing the leg splay too. Its not from the bedding, but she's doing alright now. I think if your chick is eating and drinking she should be okay. Just watch her. The leg sounds like its sprained. Make sure to clean any wounds you find...