Sounds like all the hens you rescued are unsure, and the only thing they trust right now is you. Chickens prefer to have smaller flocks, so they may break off into their own squads. It sounds also like they need a rooster, in my opinion. Do ur laws allow that?
We had a hen who had to stay inside because she was sick… we loved having her in the house, and we put a chickens diaper on her. It would give her something to do, and the diapers are normally washable. You can get them on Amazon for less that 10 bucks!
She may also be bored as well. Try giving extra stimulation. When my chickens do that they are normally looking for something or just bored. Give her an iceberg lettuce ball! Or pumpkin or squash! Chickens love that, and you can get the overripe stuff on sale at mainly any grocery store! 😊😊😊
it sounds like she is looking for someone or something. Was there any chickens left at the persons house? Does she quiet down when you go near or interact with her? She may have lost someone she was attached to and looking for her. Chickens can create incredible bonds with other chickens.