You must really love her to let her learn on your S2000!

I like the
MCS; the clutch is pretty easy to engage (my coworker with a Mustang has to basically kick into the engine compartment to engage the clutch), shift action is smooth and easy (though I occassionally mistake 2nd for 4th, d'oh!), and has really good pedal placement.
And if she doesn't take well to the manual in your S2000, there is always the automatic
MCS, which everyone says is really quite good as far as automatics go. (No "manual vs. automatic" diatribes here please, different strokes for different folks).