Well theres several things that could be attributing to her not eating. First off being that its winter and cresteds will eat less, this is due to light cycles, lower humidity, and lower temps. Stress is another thing, if you are continually handling her or switching up her tank she will tend to eat less. I would get a gram weight on her and post it here, if you could provide us with a picture as well that would help me establish her overall size.