Never Heard Of Hogwarts

I never expected to wake up, answer the door, and see a very, old, odd looking woman standing in front of my door. She was wearing a green-ish robe, and for some reason, a pointy hat.

"Are you Kari?" The woman asks. Wait... How would she know my name? I'm about 98% sure I don't know her, and despite that, she seems to know me pretty well.

"Yes." I answer, my voice somehow managing to squeak on the last little bit.

She looks at me kindly, opens her mouth, and says "May I speak with your parents?"

"Um. Sure.- Mum! Come here! There's someone at the door who wants to speak with you!" Mum doesn't say anything, but I hear her shuffling around somewhere in the living room, already approaching.

Mum enters, looks at the odd woman, and speaks, "Hi. May I ask who you are?"

"Yes. my name is Minerva." once she finishes speaking she holds a crinkly hand out, obviously wanting to shake my mum's hand. my Mum, not easily grossed out, takes Minerva's hand, and shakes it.

My Mum gestures for her to enter, and Minerva does so. And as my Mum is leading the woman to the living room, she starts a conversation. "So Minerva, what's the purpose of your visit?"

Minerva sista on the sofa, facing us, and asks a question. "Have you ever heard of Hogwarts?"