She could be broody??....My grumpiest hen went broody last week :evil:. They usually growl or peevishly squawk at you as you go near or go to touch her. Mine is grumpy all the time, but is even worse when broody, she practically screams at you if you dare to just walk past!!! If you turf her off does she go back in rather quickly? Have you felt her underneath? They are usually very hot to touch.