Need advice for a WW who left Part 3

[dwh15]

Went from missing WW to being angry in just a few minutes. She made plans for the kids at 1pm today w/o saying a word to me. Typically she doesn't pick them up til nearly 7pm. And as a bonus, she wanted to know if I could send them some money for lunch. This all with less than an hour's notice. Apparently she had told S18 and expected him to relay the message. I sent a TM that from now on, she needed to communicate directly with me regarding changes in the normal schedule. That lead to a bunch of TMs back and forth, and we finally agreed to just sit down and come up with a different schedule. We're going to formalize it in writing and both sign it. Was her idea but I immediately agreed, which I think surprised her. All along, I've been going by what she asked for, but then it's always my fault when she makes unexpected plans and the kids choose to stay with me because I'm doing something they prefer.

I think it's time to just formalize the plan for time with kids. Need to have set pick-up and drop-off times. Getting sick of her thinking I have some elaborate plot to keep the kids away from her, just because I'm trying to do fun things with them.