[igotrhythm]

The main problem with that is that FFR really doesn't cater to pad play, though there are a few index friendly files in the upper ranges. Namely, the "proper method" of standing on a pad, feet on the left and right arrows, will quickly cause you to boo out.

A better option would probably be to look on Stepmania for pad files, particularly in the lower end of the difficulty spectrum. So stuff like Stepping Stones Of Stepmania or Plaguemix, or the beginner files that ship with SM5. Those should be good until you figure out how to install more. Stepmania itself should also come with a tutorial for how to rig up a dance mat.

Check the Stepmania forum and the Simulator Files sub-forum for more information on that. Best of luck on her foot-stomping journey to fitness!

Edit: This activity gets very strenuous as you improve. So it might not be the best choice depending on her athleticism. Talk with a doctor before starting any fitness regimen, yada yada.