It's hard to say, it could be her pre-ov shed. Is she still breeding? I have one female that lays on the heat coiled up almost perfectly for majority of the breeding season and if she goes this year, which I think she will, this will be her 3rd year laying in a row. You can't assume that just because they are coiled up on the hot side that they will for sure lay. My girls usually put on 200-300 grams even when they aren't eating.