I would be tempted to leave her with them. Protection from the bigger girls and an educator.
It would be a shame to keep her in the tiny integration pen instead of free to roam around the coop and run with her brothers (I sold all her sisters).
How sweet. Maybe she'll want to be a mama hen soon.
She's in the vicinity of 12 weeks now, but about half of my Blue Australorps eventually go broody.