Have her take the MSF course first. If she gets through that and passes it, and still has an interest in riding, then that will be a good indication that she really wants to ride.
If she does, start her on something small (EX250 or 500, or Hyosung 250 - something along those lines). Have her read the stickies in the new rider's forum here if she objects to starting small.
Go to all the dealers in your area and have her sit on all the new-rider-friendly bikes you can find and see which one fits her best.
Good luck and let us know how it works out.
