This is Anastasia, a delta for the Keystone pack. She was a member of the original Keystone pack for a few months in 2010, around the time Nicholas was banished. He's the one who bit her, so they share a link. She remained with the pack for a while after he left, so that she could learn proper werewolf etiquette, but she left to find him after a while. At the time she left there were no hard feelings, and I would love if she even had some friends within the pack. They could have kept in contact after she left, or not.
When she returned for the pack takeover, she was a willing but possibly regretful participant. Her link with Nicholas has only strengthened over the years, so she followed his plans to a T. Now she's on alert for a second pack, but even if she has old friends in it, don't expert her not to rat on them if she finds out the pack's whereabouts or plans. Lines with members of her own pack would, of course, also be loved.