What can I do to get her to do it with me?

[okr]

Congratulations.

Now that you've finally played Mario Kart together for two hours , you could ask her for some NSMB Wii. Avoid DCKR. I heard it's too hardcore for most people, so it could be too early.

Tip: Next time she gets tired invite her to some Endless Ocean deep-diving for recreation.

Until she's ready for more co-op action you can return to Wario Land: Shake It!