You probably do not have any right to seek maintenance. If you waived maintenance when you were divorced that waiver is permanent and will not be reviewed by the Court.
As for the amount that should be paid to the IRS, you can have that amount reduced to judgment, garnish her wages, and then pay the IRS. Alternatively you can file for issuance of a contempt citation and ask the court to address her failure to follow the court orders.
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You may go back to court on a contempt citation for her failure to pay the taxes, or as my colleague states, you can get a judgment for what your ex was supposed to pay, garnish it from her wages, and use that to pay the debt.
Whether or not you can modify the order to get maintenance depends on whether you waived your right to receive maintenance forever, or whether you just were not granted maintenance at that time. You want to review your separation agreement if you have one, or the court's order if you did not reach an agreement. Generally, once maintenance is waived, it is gone forever.
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