Don't make this too complicated, F. She doesn't know you are starting on a different plan. When in doubt about your kids, check back to see if they are okay.
Why can she not leave a message? If it were an emergency, would she text you to notify? I do believe this is a good time to leave some type of instructions to alert you by some specific means when or if it is very important and has to do with your,children. You can't just ignore an attempted call from her when you have no idea about the kids.
Whenever a LBS has to step back from the WAS, always have in place some type of plan (if nothing else, a code word) for her to use if one of the kids are sick, hurt, etc.
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!
