I didn't see my Black Australorp at all this morning so I went into the coop to see if she was there. She was in one of the nesting boxes so I figured that she was laying an egg. I came back almost eight hours later and she was still there. When I opened the box and tried to pet her, she made this weird squawking noise and puffed up (not in an aggressive way). I took an egg out of the fridge and put it by her to see what she would do. She stood up and pushed the egg under her and then sat back on them. Is she broody?