I'm not really an expert at this, since I've only have my leo for a bit more than a month, but I think I've read that giving her a bath and helping her with the dead skin is the right thing to do. Also, do you have a moist hide for her? Actually, in her cage, you should have 2 moist hides, 1 in the warm part and 1 in the cool part. And be sure to keep them moist all the time.. The rest of the cage should have low humidity. If you keep them like that, there is little chance that you get shedding trouble. Maybe someone else here can help you a bit more with it.