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Most likely caused by another chick(s) pecking at her. It looks like it is the back and the vent area, if she had a little poo stuck to her someone may have picked at that and then it progressed from there, if chickens see blood, they go for it. If you can clean her up where she doesn't look...

Separate her from the others, keep her warm and make sure she eats and drinks well. You can apply some neosporin or vetericyn to the wound. How many chicks do you have in your brooder? Any photos of your brooder setup?