I got 10 Leghorns and 5 Isa Browns from Hoover Hatchery on Friday. 2 Isa Browns were doa, dead on arrival. 1 was struggling, it past away later that day, Saturday another one started to struggle, it past way too. Now my last Isa Brown "Autumn" is struggling. She had a pasty bottom, so I cleaned her up and gave her cracked oat groat with water and a little kelp. That was about 3 hours ago. I checked on her just a short while ago and she is very lethargic and salivating,( drooling) and has diarrhea .What does this sound like? Please help.