You might try bumping the warm end up to about 90. I wouldn't cool her down. I'm thinking the prey you are giving her is to small. I have a king that is about a year or maybe a little over and he's eating two hoppers every 6 days. My warm end is 90 sometimes 92 depends on the room temp during the day. My cool end gets to about 72 at night to 77 during the day also depending on the room temp. Try a bigger food item and see if that entices her. are you feeding in the enclosure or out? I had to start feeding in the enclosure. He seemed to feel more secure in his home. anyways thats just me some people have there own methods.
If you use aspen for substrate try to use less of it over the heat pad that way the heat can penetrate through the aspen. That has also worked for me.