This post is old, but it was so reassuring. I am having the same experience with one of my girls. Squatting, nesting box interest, egg song...no egg. She's taking a lot longer than my other girls. What a tease. Lol Hoping for her first egg soon!
Mature chickens can kill babies. Fortunately our girls are so sweet. We have never had an issue introducing newbies. We have Barred Rocks, Rhode Island Reds, and Black Stars. They love us, the dog, the cats and anything else we add lol. But just in case, we always do a fenced introduction and...