Sorry to hear about this neighbor. The best first step here will be to remove and reinstall the Ring app on your mobile device. Please ensure to log in as owner, and select the proper location from the dashboard in the Ring app to see your existing devices. In your Video Doorbell 2 device health there is an option to change network which will take you through similar steps of a setup to connect to your new network.
If you are still unable to see the device, check your email as attempting a setup should have prompted an email to the owner account for authorization of new device owner. This should only happy if you’ve changed emails or account logins. If this concern persists, please reach out to our support team for more in-depth troubleshooting.