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Ivermectin pour-on is the one that is usually recommended. You put a couple of drops on the skin at the back of the neck--I'll see if I can find some info on this... https://www.backyardchickens.com/forum/viewtopic.php?pid=2525157#p2525157 (down at bottom of first page)

You could try the ivermectin, it shouldn't hurt her--have you opened up her mouth, shined a flashlight down and taken a good look?

She may be getting ready to lay, and this might explain some of her behavior. They do complain an awful lot before they figure out how to get that egg out and where to put it. How big is their coop? I can't imagine a 60 watt bulb being that much of a change unless it is really small. Check for...