As a monitored video plan you would need a new Alarm.com account for them, so that it has its own monitroing account, call list, monitored address. This would need to be its own account.
You could set it up so that you have login access as well to the account. This could be done by either linking your existing login credentials to the new account so that they can access both, via the steps in the guide below, or you could create multiple logins on the new account. Either would allow you to help with arming, and you could purchase and manage it via your Suretyhome.com login.
I saw some posts about android tv, fire stick, nvr hdmi display etc. she also really can’t log into a web browser
I am linking a guide below on displaying video continuously. The SVR option would give you 24/7 recording as well as an easier method of viewing the video stream through HDMI.