If you don't feed them enough they stay wound up. Sounds like you are underfeeding. Esp if she skipped a meal after a shed.

I just went through the same thing. My carpet finished shedding (so he missed feeding day). I fed him a large rat and he owned it so bad the cage looked like a murder scene. After that he stayed up for about two hours looking around for another one. He was really wound.

If you're feeding so small you don't even see a bulge then your snake might be seriously hungry. Feed her enough so that she goes to bed for a day or two.