I think you have handled things very well. She will think twice next time. I don't really think she was expressing 'no remorse' in the comment about her dad holding it over her, it sounds like she wanted to say something 'tough' to save face you know, that she's tough.
I also really commend you for recognizing that your anger with what she did is bluring your vision right now and that a separate trusted adult might have clearer thoughts and counsel for her. Just try to remember that you are angry with what she did not who she is. Big hugs for you!!
Wendy