I would stop handling her until you get her eating.

I would go out an get an acu-rite or other digital thermometer/hygrometer so you can be sure what the temps & humidity levels are at. The one that seems to be the most bang for the buck is pictured in the link below, and can be found at most Walmarts for around $12. It will display 2 temps (one measured at the unit and the other with a probe) as well as humidity. Similar items are also available at Home Depot and Lowe's.
http://www.partshelf.com/acu00891.html

Once you have a way to accurately measure your temps & humidity, then it will be easier to determine what steps you should take to fix any problems. However, a good start would be to get a UTH and preferably a thermostat, but a rheostat (dimmer) is an acceptable less expensive alternative, as long as you are diligent about adjusting it as necessary. Also, to keep in humidity, most people partially cover the screen top. A few layers of aluminum foil works well and is inexpensive.