Get a shoebox sized plastic container with a lid, fill it with about 1/2" lukewarm water, place snake inside, put the lid on and place the whole container(snake and all) inside the snake's enclosure on the warm side. Leave it alone for an hour and then let the snake run through a rough, wet face cloth and see how much comes off.

You can do the one hour soakings once per day. Make sure to get the shed off of the tip of the tail, the eyes, and any shed that is completely encircling the body.

Hope this helps! And you might want to make sure your husbandry is up to par so she has a good shed next time.