So I have four hens that are all healthy, active, and playful. However, one of my hens, a Barred Rock, has been acting quite strange lately. She will go into the coop and pace back and forth. She might jump onto one of the roosts for about a minute, and then jump into the nesting box like she is about to lay an egg, but does not. She even sings the egg laying song. It's almost as if she feels like she can't get comfortable. She is right at a perfect laying age as well. Does this mean that she is going to be laying rather soon? Is this normal behavior for a hen who is about to lay?