Really, as long as she's got it off of her eyes, and off of the tip of her tail, it's okay if she has that. Make sure you got the tip of the tail off.
But when I have a new snake that has that kid of awful shed, sometimes I'll let them keep the stuff on their backs or on their chins. (Chins are the absolute worst to pick off. I don't do chins anymore.) Carrying around a harmless but annoying slab of dead skin seems to help their bodies calibrate better for the next shed...
And next time you'll see it coming, so you can boost the humidity. And next time she'll be a little bigger, and it's easier to rub shed off of larger scales. It'll be better next time.