You should get rid of any hut or hut-like object (if it's a tunnel or a sleeve or dims the light around them, it's a potential nest-- even a room with dark colored walls can do this--as shadowy spaces are nesting spaces and you are already seeing the proof. I once let Noodles play with a very shallow box (less shallow then a shoes box, turned on its side) and within a few weeks she was quaking etc (panting etc)..Get rid of anything even remotely shadowy. They can sleep on a perch just fine **do remove it when your bird isn't looking, and don't be surprised if you get some upset--- it will possibly take time because instinctively they know to hold onto their nests...but unless breeding, they wouldn't use them...They ALL love shadowy spaces (just like they love other sexual stuff, like petting under the wings etc etc-- also bad!!)
Even being on a high-backed couch or bookshelves/under tables etc in broad daylight is more than enough to trigger most. Seriously, I'd just get rid of anything even remotely shadowy and make sure you are getting her 10 hours sleep per night (dark/quiet) on a set schedule.
Pet on the head and neck only and avoid paper crinkles or any easily shredded toy during this stint (although the no touching other than head and back, 10 hours sleep nightly and no shadowy spaces should be lifetime rules with your bird).
