I was totally convinced she knew something I didn't.
She did not.
Isn't this the story for all of us, to some degree? We assumed that the adults in our lives must know something we didn't. Sure, some of the stuff we were being told seemed screwy, and maybe our teachers and schoolbooks disagreed with some of it, but it wasn't just our parents, it was this whole congregation of adults that believed it! And some of them were pretty smart! So surely they had good reason to think it was the truth.
They did not.