[YaeGh8Vo]

We don't know enough about OP's situation, so we're both projecting quite a bit.

Of course communication is important, and the first thing I would do is talk about the shared expectations we had for the children's schedule. Maybe she didn't understand or remember. Or maybe something on her side changed. Take the calendar, mark explicit downtime hours, and talk about how those should be treated.

If that doesn't work, then it's tough. It might be some deeper patterns in the couple that needs to be broken down and restored. Or a psychological issue on her side. That's where the change of behavior can be useful. It's still communication, on the non-verbal level.

Anyways, I hope OP does something and doesn't just let things fly by.