Neighbor trying to convert me

There is a lovely woman in my neighborhood who introduced herself to me at the kids' playground and was forward about exchanging numbers. It's not something I'd normally do, but she was persistent and to be fair, kind. But I was a little put-off by her forwardness -- this is NYC, after all.

Soon after this exchange, I've gotten mail once a month asking me to consider joining the Jehovah's Witnesses. It's addressed to me, with my full name, and my phone number is in the address block.

I have a strong feeling these two instances are related.

I see her often around the neighborhood (like, 2x a week!) -- do I say anything, and if I do, WHAT do I say? I have a feeling the answer is keep my mouth shut until there's proof, but the mail is creepy, man. I feel really exposed.