It's hard to say. When you decide to put her back, do it when someone will be around to keep an eye on things, because there is a good chance that they will attack her again.
Try cooking her up a scrambled or hard-boiled egg. Let it cool, chop it up and feed it to her. If she doesn't peck at it on her own, wrap her in a towel, and try to force a small piece into her beak. You might have to use your fingers to gently force her beak open. Sometimes all they need is...