The important things to do now is to get her US passport, as this is what she needs to travel abroad and return to US. As newacct said, at the same time , apply for her cdn citizenship card, as it does take time.
Her Cdn passport is not really of great importance, as canada allows Cdns to enter Canada on US passport, but US does not allow americans to enter on Cdn passport.
She may, of course, be entitled to a third citizenship based on your wife's.