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Is it possible for you to put her inside the coop with the 7-week-olds, but place her in a dog carrier or cage with food/water, where they can see each other and get used to each other's presence -- but no actual mingling, for a couple days at least. Then let her out, and see how she does with them. If it is THEIR Coop, and not hers, she has a little more adjusting to do. I wouldn't worry too much about her initial pecking, unless they are very much smaller than she, or if she is damaging the youngsters. You could also give them all a couple flock blocks or a rotting log, to help the introduction go better and give everyone lots of interesting things to do. Also make sure there are multiple feeders and waterers - a feeder and waterer available at opposite ends of the coop - at least until the lonely big chick has been integrated fully. This will give everyone, even those being victimized the worst, a place to run to get a drink or take a bite of feed. Provide also a hiding place, such as a piece of plywood leaning up against a corner wall, so that smaller chicks can run in and hide its head from a bully such as your 12 week old.