Hummm....kind of strange since she is considering herself S while living under the same roof. Is this a woman or man friend? I assumed it was a lady by offering the phone number, but I wonder why. I can't see it testing you in trusting her since she is seeing the M as over. Kind of weird. I don't know, to be honest. Just mark it down as nothing to worry about for now.
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!