That happens a lot with my mum.
So I built her a gizmo with a few colour LEDs, one each for WiFi, "the Internet" (can ping Google), our email server (port 25 responds), and her solar system's web page.
It's basically an ESP with a few LEDs from an addressable RGB light strip, all built into an IKEA picture frame that has enough space behind the actual picture plane to hide the electronics.
Now when "the WLAN does not work", I can ask "which lights are red and which are green" and save eveyone involved a lot of frustration.