I have 4 hens and one rooster, they are all Rhode Island reds. They've all been doing so well and just reached 19 weeks. Yesterday, I noticed the smallest of them was acting off. She continually opens her mouth but no sound comes out. I also observed that her legs are shorter than the others and she appears much plumper. She is eating, I brought out an ear of corn and she attacked it with gusto this morning. She's also drinking etc. last night when everyone went up to roost she was sleeping in the box. Same thing this morning. Everything I am googling is just scaring me so I thought it best to post it here and hope for some advice.