Ok...just did the nasty. Boy was she shocked. She's crying in her room (on her bed) right now.
We sat her down and explained how she had made us feel, and how this did not come out of the blue but had been building over the last several years. We added that we have frequently warned her that it could come down to serious repercussions, but that she never believed us.
I also held out the carrot of incentive. She's pretty devastated though.
Tough love...next few weeks are going to be really hard...