Hello, I am new to chickens. we got 2 from a friend a few months ago. They were healthy and laying beautiful eggs. 3days ago 1 hen started to seem ill. She was just standing in the yard drinking from a puddle. She would not move though. And I would find her sleeping on her feet at the puddle. Next day same thing plus she was having some loose poops. I cleaned up their coop have her fresh water. She went into the coop early last night And this morning she had already passed. Does anyone know what could have been wrong with her ? My concern now is will my other chicken get sick? And Will she be ok by herself?