My 20 week old EE, Johanna is acting a little off today. She was the last one out of the hen house this morning and was a little reluctant coming down the chicken ladder. Then I saw the rooster mount her for the first time. She's a little slow in general compared to the others today. She's eating and drinking, but is the last to come when a treat is offered or when the others move from one end of the coop to the other. She's seems fine otherwise. Does this mean she may be getting ready to lay or do you think something else is going on here?