You appear to be saying that her computer has no internal WiFi adapter card, rather something like an external dongle [mentioned by ImJustAnotherOkie in post #11].
You can examine her machine with Device Manager for the presence of an internal wireless adapter card, if you don’t know if one is present.
It would be under “Network adapters”, something like an 802.11n device.
You could also move your router [mine is pretty portable] back to her computer and direct-jump from her ethernet port to the router ethernet port with your ethernet cable to test her ethernet port.
Of course, if it works, you’ll lose your link [Queen’s Rights!!] unless you have a working wireless card in your computer. :)
I HAVE SAID, my computer is connected by a cable and hers is (not) connected with the ethernet plug, per Windows diagnostic(s)