For the last few days my buttercup, Pebbles, hasn't been doing so well. She started out just not being her usual friendly self. Then I noticed her crop was huge, and very hard. Then I noticed that she walked unsteady. I separated her and gave her water with apple cider vinegar in it and limited her food. Well, her crop has finally gone down, but there is still a very hard ball feeling crop. It seems like she's having trouble swallowing now, and moves her neck and head back and forth, maybe to work water/food down? Not eating or drinking much now. Any suggestions??