In fact, though I also use three languages, the only one she and I have in common is English. Though I learnt some Marathi as a kid it was just how to read and how to talk about family relations (so limited in the European languages!) and food. We were in a part of Australia that hadn't yet heard that the White Australia laws had been abolished so speaking anything but English, even in your own home, was Very Bad, and emphasized your wog status.
I run into Mumbaikars and Punekars all the time here in the bay area but most are Hindi speakers.
Most Maharashtrians I know from the previous generation (including my parents) are from Maharashtra, and Maharashtrians have somewhat of a reputation for not wanting to leave Maharashtra.
Now it's become just another huge city IMHO.