Joe,
As William mentioned, only a U.S. citizen can petition parents for immigrant visas.
If she stays on track for her citizenship, you're probably looking at another 4 years or so until your wife could become naturalized, and then another year or so for the I-130 processing. Mom could conceivably be here on an immigrant visa in about 5 years or less.
In the meantime, there is nothing to prevent mom from applying for a visitor visa, which if approved, would allow her to visit you for maybe 3-6 months at a shot.