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Since it is in your wifes name it will be up to you (her) to prove it is indeed identity theft.
A DV isn't going to help since her name is on the account. A direct dispute probably wouldn't either as it would be her word against their records. It all hinges on the fact that her name and SSN were used without her knowledge or permission. And that is fraud and/or identity theft.
Here is a form from the FTC uses for this:
http://www.ftc.gov/bcp/edu/resources/forms/affidavit.pdf
Look it over and decide what you and your spouse want to do.
There are so many posters who go through the same thing.
This may be the reason the utility companies are asking for so much info and soft pulling now. this is just awful.
Have your wife file the report. Let her mom deal with it. At some point, you just have to look out for yourself.