The question is expected and something she's answered before, actually.

"Oh no! Not everybody. Only people who are... like me but aren't?" How to explain this? She still finds it difficult at times no matter how many times she's had to address it. "I know it might sound a bit strange but there are others out there. Others like me, like ghosts, or something else like... witches and werewolves if you can believe me. Most of the time, they're the ones who can see me."

She knows humans can often see her now and then but that's rare and makes that clear enough. "While normal people can see me it's a bit like a blue moon: Rare. Does that make sense?"