Also she's stunning and looks like several of my EE.
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Is it dark in the coop where you have her? That will reduce activity and eating. If she's not sick, it would be better to figure out a way to separate her out where the rest of the chickens are. The least stress you can cause her the better. Some birds just don't do as well alone, and keeping them in the company of other birds helps them do better. Just guesses since I can't see your bird, nor do I know her.
When I have one crated I just put a large blanket over the crate at night. They usually go to bed as usual that way. Give her some time to recover from the trauma and settle down. Some birds are just more flighty. I also usually keep a blanket or towel on top of the crate all the time so they don't feel attacked from above, or get pooped on. The other chickens will get on top of the crate.