I would just leave her alone until after she has shed. Snakes are vulnerable while blue- they can't see well, and their instinct is to just hide away until it is time to shed. In nature, she would not be out hunting and eating. Many people feed snakes when they are blue, and everything is fine, but occasionally a snake that is fed while blue will regurgitate. I try not to feed snakes while they are blue because of this. Some snakes refuse to eat while they are blue, and then you have wasted a mouse, too. (Good reason to have two snakes!! But not in the same viv!!)