This is happening for me currently. Very frustrating as I thought I would be able to pair my ghost coming soon the way she was eating prior to 1100g. She was AGGRESSIVE jumping out of the tub after rats before, now she jerks into the corner like it's the most disgusting, terrifying thing she's ever seen.
My solution is only thawing 2 sm/med rats for 3 1000+g snakes. I offer her first, then my pewter. If either of them refuse I feed the bee who is ALWAYS ready to eat. I got tired of wasting rats and sure as day she is still refusing and I'm not wasting.