I agree having to jump down from the nesting box isn't going to help her heal, she needs to rest that leg. You know when we get a sprain we have to sit around with our leg supported? well that is the kind of rest we're talking about.
Very pretty chickens by the way.
It sure does look a might swollen, could be she landed wrong when coming out of the nest, just hard to know. But like @picklestheduck mentioned rest is the only way for a sprain or injury to heal. We can't put a time limit on how long it will take to heal though. You could add some poultry Nutri...