Glad she seems to be doing okay. Keep us posted.
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I had a pair of Light Brown Leghorn roosters who did something similar. They picked at the rear ends of my chicks that they were hatched with until their intestines were pulled out. I put down about 10 chicks because of what they did to them. They started the habit very young (before they had all of their feathers!). Well, to get even with them and because I was fed up with their canabalism I put them in with the big chickens and the big roosters to fend for themselves. They picked on by the adult chickens for about a month and quit their bad habits until one day they killed my last Ameracauna chick from their batch to the point where I had to put her down too.
Long story short... I had enough. I couldn't trust them ever again. They were a couple months old so I kicked them out of the coop figuring that if they could survive outside then I would continue feeding and watering them. They lasted about another month before nature picked them off. I thought about putting them in their own coop and keeping them around but they murdered far to many and they were not going to get anymore help from me. Their diposition was not one that I wanted to pass on to future generations.
I've delt with cannabalism many times. It usually starts as something small. Like pecking the crown of one chicken developing a taste for blood. Then they start on her back and fleshy sides under her wings. I've learned that the best way to deal with birds that have a desire to do harm to others is to get rid of them and not to let them hang around in your chicken gene pool.