You need a moist box. A small tote that will fit inside her enclosure but large enough so she can move around (it is fine if she cannot stretch out, this is only temporary), wet paper towel and a rough hide to rub up against. Place the plastic tote over her heat pad inside the tank and wait. it should come off with that. The wet paper towel will make the box pretty humid and will provide the grip your snake needs to pull of the old skin. Just give it a shot. You may have to leave her in there over night but I would place her in it right away. Do not leave her in there any longer then three days.