I see how the 3:30pm thing might sound presumptuous of me.
How about this?
"Since you had no intentions of doing a half day for E, should I be there at 4pm as usual or do you have other plans?"
I'm not expecting a response (a non-response can also be seen as negative against her). If anything, I'll use what I journaled here today as some kind of proof. Better something than nothing, right?
