Knowing ball pythons, I'd just be glad she eats. Some snakes are goofy like this- I think the tail end probably has more scent than the nose, perhaps that's why? Not much you can really do about it, & you already tried my only suggestion (using a hair dryer to warm the head more). The only other thing I can say is if it really is about the scent, get a hold of some rat droppings* to add "fragrance" to the nose? *If there are none in the bagged prey you have, you could ask a pet store nearby for some.They'll laugh at you, for sure, but that's life with snakes, eh?