Chicken wire keeps chickens in but, doesn't keep predators out. You can reinforce by running hardware cloth from the ground up 18" or so - to prevent raccoons from tearing thru the chicken wire. They love to reach in and eat any body part they can snag.
thanks for the suggestion. the ladies will be closed up inside at night to help protect them from predators too. And lots more rocks along the bottom to keep anything from digging under.