What about just asking her if there is some way to mend the relationship? If she really feels sad about it and wants things to be good between you two (as Kaigirl reported here), then why not just ask her what it would take to be welcomed back into their life?

It would also be useful to know what her boundaries are, so maybe ask that as well? It's guaranteed that you won't like the answer, but that would be true of any relationship where one party feels that their boundaries have been crossed but the other feels they did nothing wrong.

Do you think it would be worth trying that?