bad shed is the only thing i can think about that would make a snake crusty
She could try wetting it with luke warm water and rubbing very gently with a flannel, You can also you pure Aloe vera gel/cream (sp) on thier skin as a moisturiserand hibascrub (which you can buy in boots) it needs to be slightly weaker solution then on the instructions tho hibascrub will help if they snake has a skin infection but be careful to avoid the mouth and eyes
