An USB-WIFI adapter might not work, but a USB to ethernet adapter should work, if getting the device internet access is all you want.
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It's usually just the antennas that got very slightly out of their sockets. Look for a how to get it openned and press the antenna wires (they should be the only real round, white plastic coated, wires you'll see) back into their sockets. And you'll be good to go for a few more years.
Thanks! Will pass your suggestion to my brother who may proceed with the repair.
Does you sister happen to put her phone in the back pocket and then sit on it? This sounds like soldering spots that got loose. Bake the mainboard in the oven. Seriously. But only the mainboard, not the screen and by god not the battery. Disassemble everything, clean the USB port from dust (you don't want the dust to melt and burn) and otherwise follow this guide: https://www.overclockers.com/the-oven-trick-repairing-your-broken-video-card-with-an-oven/
Surely can't be good to put it in the same oven you prepare food in, can it?
There should be a layer of aluminum foil under the thing from what I've heard but otherwise it's apparently fine.
Any WiFi usb antenna is going to be a gamble if it works. I've gotten some that work on my Poco F1 but don't on my 11T pro, and vice versa.
I'd see if it's viable to have the phone repaired or of you can diagnose the problem yourself once you have it opened up.