"Thought to do"

"Please let me know if you've thought to get [child's name (her mother left her with relatives in another city, telling me I could go get her early if I wanted to, while she went on a trip)] for tomorrow."

I perceive the phrasing there as a "jab"...driving five hours to pick up the kid for her isn't like remembering to get eggs while I was out. The tomorrow in question is a family get-together that would be quite uncomfortable. It's not likely to slip my mind, is what I'm getting at.

She claims to have meant nothing different than simply "please let me know if you will get [child]", and I have a hard time explaining why I was hurt by her words. Could anyone help me, clarify what "let me know if you have thought to do something" means?

Or, tell me I'm imagining things. Or, not imagining things, but an oversensitive idiot?