The first thing I would suggest is to not put her in a separate tank. Try feeding her in her enclosure. Moving her may be stressing her, and the security and familiararity of her enclosure may help.
If you are going to try F/T, and she doesn't come out after it, then just leave it laying about 2 inches in front of her hide, turn off the lights, leave her alone, and check on her in the morning.
If you are going to try feeding live prey again, do not leave her alone, or unsupervised. Usually, if they don't strike within about 3-5 minutes then they aren't going to.
A couple of other things that you can do is contact the person that you got her from and verify whether she was started on mice or rats.
Also, if you aren't using aspen substrate, try that. I honestly don't know why, but sometimes, that works. Good Luck.