My silver laced wyandotte was very sick this morning when we let the girls out in the yard. She was hunched to the ground and was shutting her eyes like she was tired and laying in the shade while the others were in the sun. I was able to feed her grapes though. Her comb was a pale pink and weak orange color. I checked on them again when they were inside, and she was underneath the coop. She was perfectly fine yesterday too! But she was just laying there and i tried to feed her some bread but wouldn't get up. I finally took a rake and carefully dragged her towards me and i picked her up. She was still alive, but still didn't look good. She was on my lap and i was petting her while someone else called the vet, and she freaked out. There was like a sudden jolt through her body and she sat up and eyes widened, and layed back down. She did this three times, and on the third, her head dropped and I couldnt feel a pulse. Some kind of yellowish liquid came out of her mouth too. The other girls are fine, and there's nothing we know of that could have gotten her sick like that. Please help!