Hi, my hens have a very secure chicken coop and run, and in the daytime I also give them access to their chicken yard. The chicken yard has a 7-8 ft fence all around it, but it doesn't have a roof. My best flyer, Amelia Earhart, age 5 months, flew over the fence a few days ago....! Any ideas on how to keep her and her friends from flying over the fence? Thanks!