I agree with Nanci...just let Juliette (yes?) do her shedding-thang.

She's rubbing her nose to get the shed started, that's all...as soon as she gets the nose part rubbed open, then she'll do her best to slide out of her old "skin" (like taking off a sock, inside out).
All of my snakes -- except one -- do all of the work on their own, beautifully...for the one with problems (my adult, Caramelo, with the flaky scales issue), I'd let him get the work started, and then after 24 hours, I'd run him through a damp towel, and that would help take care of the rest. It took him about a year's worth of sheds to get to the point of now being able to do it all on his own...

Only on one or two occasions with him did I need to intervene with helping remove "skin"...otherwise, hands off. Just relax...
I can't say that I've ever seen my snakes sneezing, though, when preparing to shed. Perhaps, as mentioned prior, it has something to do with the substrate...I don't know. Is your snake on aspen/paper towels?