She is about 12weeks old and is at the very bottom of the pecking order, when i went out to feed them yesterday she was sitting right behind the door to the house in the grass and the others were walking right over her. i picked her up thinking she may have survived some sort of predator attack... I've had a raccoon and a hawk attack before. After checking her whole little body I see no scrapes, cuts, bruises, or breaks. so i'm thinking not a predator. she is now inside in a dog cage but she won't stand up, she will move but its like she is crawling and she doesn't hold her wings close to her body they are kind of let out. She looks completely alert, eats and drinks fine, she has normal looking stool except for one yesterday that was rather large and bulbous about the size of a quail egg. I can tell she is in pain she kind of squeals when i pick her up but still i don't see/feel any broken bones. what could be wrong? I have 11 other chickens and no one shows any problems of anything.