Okay, one of my birds has had chronic mites since I recieved her. She's a little droopy, even when the ivomec kills off 98% of the buggers, and take her off the ivomec for more than a week and they're back, in full force. I've got 7-dust, and used it, which works, for some time, before the mites return. The mites never seems to travel to the other birds; they're untouched. Since my mom is a vet, we're going to try several other methods of removal, but what do you pest-battle-hardened poultry experts think I should do? Is there some exotic cure out there, or should I just...off her? Opinions GREATLY appreciated.