One of my hens got injured by a hawk when she was 5 months old (she is now almost 2 years) and it healed, but she had a permanent limp. One of my family members may have noticed that it started to get a little worse... like she let the other chickens go to food before her, being left behind or pecked at. Now, just today, when I let them out to free range for a half hour, she did not come out with the others and I had to take her out of the pen. One of her wings seemed to hang a little and she remained laying down the whole time they were outside. She did not eat the grass nor accept the grass I handed to her. She kind of seemed a little tired. I am thinking the pain in her leg just increased but am kinda worried/anxious it might be something else? For the night, I arranged a separate place for her from the others with food and water. I am wondering if there a particular food or drink I should feed her? Or is there something I can do for her leg? Or if anyone thinks the cause is something else?