If you can get a picture of the position that'd be helpful. I have a Sun Conure who used to masturbate in her fuzzy tent/get into an egg laying position and make weird noises. I dont know what kind of position your green cheek is exhibiting though, therefore, take my advice with a grain of salt. I wouldn't want to tell you one thing and it actually turn out to be a serious medical issue! If this is what she is actually doing egg laying position/maturbating in and of itself can cause serious medical issues if she becomes egg bound. If this is the case then in my case, I removed the tent to stop the behavior. My Sun Conure, after removing the tent, then started masturbating/rubbing her vent on certain toys and those I removed too, but, of course I replaced the toy of affection with another toy that wasnt an object of affection and into a different area of the cage. Hope this helps or gives some insight!