I have a chicken that is 2 1/2 years old. She has had loose stools for 3 days now . She can barely walk and appears as if she has an egg stuck in her. She will take water when offered and will eat veggies from me. She doesn't appear to be in pain, but won't walk. When I try to get her up she stands straight up as if she's bearing down. Has anyone ever had this happen and what do I need to do??