I would give her a day or so to get it off herself. If she can't get it off then you might have to step in. I would suggest the pillow case trick:
Snakes can be placed within a pillowcase with a damp towel. The towel should be wet enough that water can be wrung out from it but it shouldn't be so wet that it puddles when placed on a solid surface. Once the snake and towel have been placed in the pillowcase it should be tied closed and placed in the enclosure near the heat source. Several hours in this environment will loosen the shed skin and the towel will act as a mild abrasive for the snake to rub against as it moves around. In some cases it is easiest to keep the snake in the pillowcase overnight. In the morning you simply open the case and release the snake back into its enclosure. The retained shed should no longer be visible.