hi I am new to this I have been following back yard chicken for many years. I have this one chicken she is about 6 years old I believe she is a Orpington Cross with a production red. She still lays an every day. Over the past 2 years she had put on a lot of weight she can still get around but you can tell she is starting to slow down. I weighed her today and she weighs 15 pounds. All my other chickens are perfect weight. How do I get her to lose some weight? Is this normal for a laying hen to get that big? Please help