How many feet can this woman fit in her mouth?

"certainly through their television sets"?  

Certain brands of Smart TV can eavesdrop, true enough.  As long as they are on, and as long as they are connected to the internet, and as long as the conversation is within earshot.  No self-respecting spy would even bother, there are far better and easier methods.

Maybe she is trying to evoke fears of the telescreen?

No, not intelligent enough for that kind of inneuendo.