How to deactivate devices from my account?

Long story short, I have a roommate who I've told multiple times to stop using my Netflix account on a Wii that's in the living room, and she continues to use it all the same. Ergo, I'm trying to deactivate access to it specifically.

I've gone to the Netflix site, went to the Manage Account/Manage Devices options, and told the site to deactivate all devices associated with the account, but the Wii is still connecting like a champ.

I then deleted the Netflix channel from the Wii entirely, but a quick redownload has her back on the couch, watching Rosanne and making my teeth gnash.

What on Earth should I do, short of yanking the bloody thing out of the living room and sticking it in a closet, somewhere?