Bridge mode? Pull Wifi network down to one RJ45 cable?

My Mom was in nursing home. I live 23 km away. I simply plugged in an Echo Show I took from my own house on my own prime account  for her to use as a phone, using the seniors home guest account; but the caregiver gave me their account,  which would turn out to be more stable.  Put some numbers in your contacts so she can say "Call my Son, or /David/Dry Cleaners, or a voiced numerical phone number. 

One cud also use a cheap dot, or even a Flex, but I wanted her to have classical music and Prime Video on the stereo speaker.  Your friend could get a free Prime account and own it herself, but then she would need to register a smart phone which also runs the Alexa App.  BTW, there is also a simple cheap phone plan for seniors at Telus.

I've also given a show to a friend in Vancouver who didn't have TV, so he cud watch Prime Video. I'm north of him on the sunshine Coast. It works even if you're not on your home WiFi, just enter their WiFi details when you're there. Use your Alexa app on your phone to hook it up.  It doesn't know where in the world it is plugged in, it just works. Also, I cud 'drop in' to check, when she used to fall at home.I made a specific folder of selected Artwork to show on her screen.

You have to tell it not to play announcements on her specific device, but she could make an announcement to you if you wanted. You might desire to block the 'drop in' feature for privacy both ways.  You may need a Prime 'Family' music account if you both listen to music all the time.  I find often you can get two music steams if one person listens to music from a voice request, and the other person uses the Amazon Music app, but it sometimes it says "playing on another device."

Otherwise, look up "wifi voip phone". Telus routers require a wired connection to the telus house line. A classic yard-sale non-telus cheap wifi router like dLink set up as a wireless repeater might work, if it advertises that functionality but I haven't tried it. Repeaters, vs. extenders like mesh, behave slightly differently.  But they would both work for her, if they have a ethernet port - for plugging a device into.