Offering a humid hide is certainly acceptable if you want to, although you may or may not even need it. Misting kind of depends on what your ambient humidity is already at. You don't want things too moist (or too dry).
What I usually say is that if your ambient humidity is in the comfortable range, or you don't know what your humidity levels are, then to just leave things alone and see how the shed goes.
So long as they are dealt with quickly (within a few days) any shed problems that might arise will usually be very minor. It's really only if any shedding problems are ignored that issues start to arise.
Typically it's recommended that you not feed until after the shed cycle is complete. Some will feed with no issues, but others will refuse the food or even have regurges, so why risk it.
She'll go blue (sounds like she already has), then that will clear up and she'll look more or less normal (if a bit dull in coloring) for a couple of days, then the shed will happen.
Once she sheds (and often they do a big poo right afterwards), then go back to her normal routines.
