[metaxis78]

There are client priority features in wifi, but your device may not support them. If her antenna has line of sight to the BS then it's not likely to be interference but something else, like traffic congestion.

I'm not sure what hardware/chipset you're using, but if it's consumer grade, that might be a big part of the problem. Competently executed prosumer/soho like the amplifi/unifi line or google wifi may make a huge difference.

However, ethernet may just be the best option, especially for streaming.

[willcipriano]

In my view: If the packets absolutely positively have to get there on time, ethernet is the only option.

WiFi has uses but constantly streaming large volumes of data without hiccups isn't one of them.

[metaxis78]

With wifi, you need to make accommodations as well. It's not just Magic Internet Waves. I've had no problem video conferencing on wifi, but I make sure to have reasonable line of sight to my AP. I also chose a model with a simplistic and streamlined design so that it didn't look awful placed prominently in my space.