I believe we need to plot, considering she's his beta! She's a born wolf, and her family was part of the Keystone pack for a very long time. Her father had been a beta when shit went down and Nick killed him and maimed his wife, Daci's mom. Daciana managed to get her mother to safety before going back to reclaim her father's body. She never looked back after that.
Before the takeover; she was always laughing and playful and kind. Now she's kind of a sarcastic, overly-serious bitch a lot of the time. Further than that, though, she's also calculating and intelligent. She's good a making plans and is highly organized and involved with her pack now. There are times, of course, when the old Daciana comes to the surface. She's still in pain, bitter, and wants nothing more (after maintaining the safety of her current pack) than to pull Nick and his followers to pieces in the most painful way possible.