remote access another mac from different network

Hi all,

I am trying to figure out if there is a Mac native way to access another Mac from a different Mac. I am would like to be able to help my Mom when she has computer problems. I have tried screen sharing and remote access. These seem to either require being on the same network or same Apple ID.

Is there a way to see and control her computer using the Mac native software or do I need a third party app? She is running Big Sur and I am running Ventura if that makes any difference.

Thanks