If I had a guess, I'd say that this teacher was just mistaken, and you appear to magnified her importance as a spokesperson for the church beyond any form of reason.
As to what you believe, I have only based it on what you have said. Of course, I don't know what you believe in your heart, and I am not trying to say that I do.
You agree that Church representatives teaching in a holy building, inspired by the words of God can "make an error" in their teachings of God's word. Thank you.