I went through my address book and found another email address for my friend. One she had used very briefly when she had ISP issues, so I sent her the card that way.
She picked it up and emailed me back. So, connexion re-established. Yes, we both got busy. And then her laptop died, then her phone, and she couldn't recover all the contact information.
I'm glad I listened to that inner voice telling me to send the card, and that I followed through.