[knarf]

Windows 10, and I’ve run the diagnostic three or four times always resulting in an ethernet not connected.

[kiryandil]

OK, I presume you both have Windows 10.

On your CONNECTED computer, you should have a connection icon on the taskbar on the lower right of your screen.

Yours will look like the little computer display screen on the left, with the plug-wire thing.

Do you remember what her connection icon looks like, or do you just get the "Network unavailable" world icon?