Hmm, I don't have a lot of snakes, but my nonbreeding girls don't really refuse. I have one girl that would refuse almost every 3 weeks exactly. I fed her a little extra when she would eat, so she grew just like the other girls, but it was a real headache! Other than that, the only juveniles I've had stop eating during breeding season was a 6 month old male that stopped eating for three months. I'd say just keep trying once a week, I'm thinking this week was a fluke.
About eating in shed, basically all of mine eat in shed. The only ones who give me grief are hatchlings and a couple juveniles. They seem to all grow out of it in my experience at least, and some hatchlings couldn't care less from the start.