Please help- All my girls are 2.5 yrs old.. My Brown ISA- our favorite was fine this am. This eve she is acting strange not her same energetic self. She laid an egg this am like most days, she lays very large eggs and was foraging around this am and appeared fine. She is moving slowly now but still ate and drank. She also pooped. I have isolated her and noticed she seems to be slightly moving around her vent area like maybe she needs to go. She just passed this. i am afraid it is a egg yolk or something. Please tell me any advice and if there is anything I need to do immediately for her. lost a hen Poullet a RIR on Thurs. She showed no signs of sickness and I found her dead in the coop. . I buried her so no necropsy was done.Thank you!