I appreciate the helpful advice from you all. Here are some photos of her:
This was the day I brought her home. The tank was not fully set up so ignore it. I used coconut substrate for the first week I had her until I realized that was what was stuck in her mouth.
This photo was taken a few days ago
This is her tank today (ignore the dials in the back, I don't use them, they're now just crappy decoration)
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To bcr229: No, her undertank heat pad is not regulated with a thermostat.
Sonny1318 makes a good point about boopin her on the nose with her food. I stopped doing that after she reacted rather strongly by jerking her head away. I have tried gently rubbing it on her side as well but didn't get much of a reaction beyond her tensing. I do keep them warm. I defrost them in warm water and periodically take them away to warm them in my hands when they've been there for a while. But it makes sense that even if I did that, if she doesn't register them as food or they're too small for her heat pits to sense that she still wouldn't strike.
pretends2bnormal: what a cutie! I hope she's doing much better now! I'm a little concerned about her food hurting her but if these babies aren't much of an issue at that age than I feel a little better about trying to feed her live in the near future.
I think after hearing what you all have said, I'm definitely going to move her up food sizes. I think I'll first try a f/t fuzzy or hopper. The place I get my feeders from is pretty cool and they'll let me see the feeders first to see their size. I'll see what they've got and go from there. If she doesn't eat that, then I may try a live fuzzy and see how she does with it.
Thank you all for your gentle responses. I don't regret for a second getting her, even though things may be a little "difficult" right now. I didn't really expect it to be easy given her state when I got her. I hesitate to say I "rescued" her but I'm pretty certain she would have died at Petco and that's a terrible thought to me. I want to take care of her and give her a good life. I think she deserves it.