Need advice for a WW who left

[dwh15]

WW just sends a TM and plans to take the boys bowling tonight but wants me to feed them dinner before they come over. She used to always provide meals on the nights she had them, but since I cut off the financial help, she pulls this every few days. Then she sent a 2nd TM saying "unless you want to send them with money to eat out tonight". This is quite inconvenient for me, as I do volunteering Monday nights and leave the house by 5:30pm, and she knows it. And I'm not giving them money to eat out every time she has them. I sent a single reply saying I would make sure the kids ate something before I left, and then would make dinner when I returned, around 8pm. If they were still hungry, they could come home and have dinner with me. Now, that may cut her time with them short, but if that's how she wants to be about the meals, then it's her loss. I'm sort of aggravated about the whole thing.