My polish, Cher, is curving her head down so she is face planting. She won't move. I tried to 'untucked' her and she flipped over onto her back then immediately righted herself and put her face in the nestbox floor again. She never even uncurved her neck. She keeps rubbing her forehead on the floor. I didnt see her come out this morning so I have the feeling she has been doing this since this morning at least. What is this???