A few days ago my 3 years old rhode island red started sitting a lot. Then I noticed she was limping on her right leg. It did look a little swollen but now i cant tell. At first she was eating and drinking but now she wont even stand up. I have brought her inside and have her propped up so she can drink. Her poop was very green and liquidy. She acts really tired. Any suggestions? Thanks Tamera.