Hi,
You often get a bit of blood from their vent when they shed but it stops quickly so you shouldn't have seen it more than once.
Are you certain the shed was complete on the head? I ask as the rubbing could be her trying to remove a stuck piece or it could be in response to something irritating her on the outside or inside of her mouth and lips.
Is she leaving any traces of saliva or anything on the cage furniture when she rubs her head?
Have you checked inside her mouth to rule out mouthrot and RI?
Could she be cutting herself on anything sharp inside the enclosure to cause the blood?
Stressed snakes will occasionally rub their noses raw trying to escape so triple check all your husbandry as well.
dr del