I used the example of telling her that the two of you could discuss next year's calendar, but that was just an example. You may not be at the place or time that you are ready to look at next year. I was thinking of a reason for having her there for a discussion other than S13 staying with her. Maybe you know a better way to turn it off.
Let me know how it goes.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!