The plug with one prong sideways is either a 20A 110v plug or a 15 or 20 amp 220v plug, depending on which prongs are turned which way. Looking at the wall outlet, the right hand prong determines voltage, 110 is vertical and 220v is horiz. The other determines amperage, on 110 vert is 15A and horiz is 20A. On a 220v it is reversed. So
|.| is 15A,110V |.- is 20A, 220v, -.| is 20A, 110V and -.- is 15A 220V. (viewed with ground prong at bottom)
There are X10 appliance control modules for 20A 110v and 220V equipment. Here is one example
http://www.x10.com/automation/x10_hd245.htm If you go this route it will at least let her turn the unit on and off remotely. You'll need to get an X10 controller to control it.