The LW is angry about her daughter's stepmother _asking to change pickup time to enable the daughter to go to a birthday party_. That's not an inane request where the stepmother is speaking for the daughter; that's a _request to make a short-term custody alteration_. Someone literally HAS TO ASK ABOUT THAT.

And woe unto someone who doesn't check for short term custody alteration because judges don't like that sort of thing. They get grumpy about that sort of shit!