Thanks everyone for the advice.
I'll definitely keep humidity up to make sure she gets a better shed next time. The only thing that bugs me right now is that I have no way of knowing if this is just ONE stuck shed, or if it has already accumulated for more than one shedding cycle. Which would change whether I have to start worrying NOW
It doesn't look thick enough to be accumulated, I think, so I guess I'll keep my fingers crossed and wait until her next shed.
Thanks again