Why was she trying to call & TM? The kids were with you so you know it wasn't an emergency concerning them. She might as well get used to that idea now....right? You aren't going to be there for her beck & call when she leaves.
You did the right thing by acting "as if". If she's pissed, then it is her problem....not yours. You did nothing wrong. Cell phones are not another limb and can be detached once in a while.
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!
