We have 4 New Hampshire Reds. 2 about 24 weeks and 2 about 21 weeks. One of the older girls started laying a month ago. The other older one seems like she wants to start laying, but now when the one lays her egg the other older one goes and sits on it like she is trying to lay an egg also, but nothing. Anyone seen this before or know what to do to get the other one to lay and not pretend to?