Sorry, i should have done the math before answering. I don't go by the percentage of body weight thing. I usually just have certain sizes for weight that I stick to.
I would bump her heat up for sure. Try not to let the cold side get under 75 and u should be fine. Is the in a tank? You can try to insulate 3 sides of it to maintain temps. If its a screen top, u could cover half or more to help keep humidity up as well...
She may just not want to eat very often. U did say she used to be a mouser, how long ago?