Chicken hurt by fox

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My chickens were in the yard when a fox attacked. The fox came at 10 am not at night like most. My golden comet was attacked and seems fine but can't stand up. Her legs stick out , bend and claws can close around my hand . She poo and laid an egg. I put her legs in a natural position under her body and secured the legs in that position. She seems more relaxed and eating. I checked her body and can't find any injuries. . Any thoughts?