Well if shes now putting in the effort to try and improve herself through therapy and better the relationship, theres no reason to cut her off and leave. She obviously cares about you and the relationship or she wouldnt have agreed to go.

As for this business vacation, if it were me, I would ask her not to go on any anymore. If thats possible. Again she needs to earn your trust again.

Shes still young and still has tons to learn, so Im sure you can be there to support her and she can be there to support you as well. So maybe you might want to bring some of these things up with her? If you have not already.