It's been about three-four days since I noticed one of my chickens is sick. I was putting the chickens up one night using their treats, and one of them, Daisy, didn't come running like she always did. I found her in a bush, and she wouldn't come out or walk. I carried her out, still she wouldn't walk so I set her on her perch in the coop where she threw up clear liquid and a smallish black worm-like thing. The next day she wouldn't leave the coop and threw up again, it looked like she'd eaten an egg or something. Then, today, she is still staying in the coop and her wattle is turning gray on the edges and shrinking almost as if it is withering away. She eats her treats if I throw them to her but only walks slowly and clumsily. Her poo is green and dry and it's sticking to the feathers under her vent. Should I separate her from the other chickens? She is about 2 years old. Please help me I don't know what's wrong!