I know of many people who I haven’t met yet; spouses of coworkers or acquaintances. In a small office setting, you hear lots of things, second- or third-hand. For example, my husband might mention the wife of a VP at his company is a math professor.
I don’t know this for sure, but many industries are small ponds and people are known by reputation. Maybe she heard about “Rain Man” (or had seen him around), and his spectacular wife.