My computer w/the cable operates perfectly . . . my WIFE’S on the other hand is not connected to the internet and it is HER computer that utilizes the plug.
That’s confusing. You’re connected, I’m assuming via Ethernet to a cable box that supplies Internet or WiFi to the cable box WiFi Router?
You’re wife is or isn’t connected via Ethernet or WiFi to the cable box?
If there’s no c Ethernet connection for your wife then it’s a wifi problem.
I’d shut her computer down, restart your cable box and give it 3 or 4 minutes then turn her computer back on.