I just going to tell you what I did... about 3 years ago when I knew NOTHING, about Xbox, Jtag's or X360 Modding..
I had the same problem as you did, the way I got one, was saying I could make money off it.
Secondly, I told her she could play Mario and Sonic.
Just think of things she would like to do on it, such as old-school games ETC.
I said a lot more funny things aswell, but then again, I knew totally NOTHING, about modding, jtags, most of that stuff back then.. haha.... and you know what the funny thing is? .. I broke it nearly a week later for leaving it on.
Just a note.. if you get one... make sure you know what your doing.