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Do they let her out at all to graze and eat/drink?

A little I guess. I put extra food and water up in the coop and also just now I put the old girls in the run and gave them treats and let the new girl out to graze without bullies. Not sure if this is the right thing but I felt bad not giving her a chance to range.

That's actually perfect. Separating them gives them a chance to get to know each other without the competitive abilities. If it wasn't getting any better that's what I would have suggested. You're a natural chicken mom! :D

Update: the distance that the new girl has been keeping from the 2 old gals is getting smaller and smaller- each day is a lot better than the day before and they are nearly three amigas already!! Whew!!