Ugh. :-(
I'm experiencing something similar with a 300g CB '06 girl who ate a small mouse reliably every week for months and then abruptly stopped; today was her fifth weekly refusal and I'm getting ready to take her in to the herp vet. Her conditions are unchanged from when she was eating so well; she just kinda stopped one day. I've left her completely alone except for very brief spot checks, she's got hides plus smooshed newspaper and she's in a rack with the other kids I got around the same time, all of whom are eating just great. It's baffling and annoying.