alpha hen not acting her self. got home from work and 3 hens ran to the gate to be let out into the yard. my alpha is usually the first one there. but today she was up under the coop with her tail down. she came out and drank a bit of water then went to the yard. i just looked out, and she was laying down while the others are scratching around. she got up and had runny poop. i went out and wiped her backside, and felt around her rear to see if i could tell she was eggbound. i cant feel anything weird from outside. do i need to feel inside the vent? we only got 3 eggs from 4 girls today. please advise. do i need to separate her?