Can not see camera on app

I still can not see the camera on my android p phone as soon as I leave the house (wifi area). It works fine as long as I’m in my mother’s house but does not connect to the app as soon as I leave.
I have rebooted her wifi, restarted the camera and also deleted and reinstalled the app on my phone. I’ve checked her wifi speed which is excellent. She doesn’t have any PC’s running off her wifi.
What is going on?
I am on beta program also.
Thanks, Michelle