Get a used original XBox, soft mod it (easy as pie), and you will give her the easiest and prettiest emulation machine she will ever know. She can also use it for music and video.
If you have some expendable cash then buy a used PSP and mod that as well. That's the ultimate in easy access emulation. You don't need a PC, you don't need to worry about whether or not the package you built will work on her PC and adding new games is as easy as plugging the PSP into a PC. I play games on the train all the time.