I'd get some accurate temps to make sure that isn't the problem. Perhaps a bulb is starting to go out and producing less heat than usual, or not penetrating as well because of the particular wavelengths that tend to stop long before the bulb breaks completely. If temps are still good, it's probably worth getting an exam.
I would assume the answer is no, but just to be sure, is there any way she has had exposure to a male and could be gravid? The timing for her to fast because she is about to lay seems a lot more on track than brumation, though it's pushing being too late in the year for that.
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