Tell her to make you a big lasagna, garden salad, and garlic bread.My mom buys cheap $19 printers.
While she's doing that, jerk a wire out of the printer.
Once you've eaten a big dinner, show her the broken wire and explain how much less expensive it would be to go to Office Max or whatever than to buy a new printer. Offer to pay for the copies, and dump the printer on your way out to the car.
Easy Peasy. Been there, done that.
Tom