She might be getting ready to shed her skin, and soaking would help to loosen it.
~Wendy~ RepStylin® Reptile Collection: Amazon Tree Boas, Ball Pythons, Boa Constrictors, Brazilian Rainbow Boas, Carpet Pythons, Chondro, Corn Snakes, King Snakes, Milk Snakes and a Retic. Too many morphs to list anymore!
Forum Rules