She and/or her husband probably checked you out on LinkedIn, that's how he shows up in your 'people I know'. It's not really that creepy.

Some time ago I was put on an assignment at another company, and suddenly people from that company started showing up in my 'people you may know' list. And vice versa probably, since I also checked out some of their profiles. This is just what people do these days when they get a job somewhere.