First off, have you checked the temperatures accurately? Just in case her heat source is failing & she's staying there because it's the only place she has enough (or any) warmth? Is it controlled by thermostat? That can fail too.
In case it's a shed cycle: have you checked her in the dark with a mini-flashlight? (cloudiness will be obvious in her eyes, in a dark room) Some sheds take longer than others, especially if you just happened to feed her when she was just going into it.
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