For right now feed her whatever she will eat. I would take a fecal to the vet as soon as you get a "sample" from her. Especially since being stressed for long periods of time could have brought on a parasite problem. Keep her destressed. Make sure the tank she is in is porportional to her size, sometimes (especially with more "finicky" beardies they will get really stressed in a tank thats too big), make sure the temps are corrects and that she cannot see the male. Try to avoid handling her until you have figured out whats going on. She may still be adjusting to her new surrondings though, so keep offering her food items and hopefully her appetite will pick up. Remember to take any uneaten crickets out after an hour or so so that they dont harrass her. But definately get a fecal to the vet, if she has parasites that would explain the appetite loss.
Good luck!! Hopefully someone else will have some suggestions too...
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0.1 Bearded dragon
0.1 mexican kingsnake
1.0.2 Leopard Gecko's
0.0.1 Rose Hair Tarantula
1.0 BTS
0.0.1 Reverse Okeetee Corn
0.1 Bullmastiff
4.1 Cats