Snakes are really good at gripping with their belly scales. If that's all it is, then I wouldn't chalk up. She's doing it on purpose. It makes her feel more secure. On the other hand, if you've got spidey hands, then I don't suppose chalking up will hurt.
Using gloves is another option. My snake prefers to be handled with gloves. I think it helps him see them as something inert, and so, less threatening.