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Your daughter needs to take the guy in for contempt of court. I don't know if she has had a private attorney, but whoever is representing her needs to do a Rule to Show Cause (contempt) and he should be made to show cause why he is not in contempt of the court order. Some judges will give the non-payor 30 days to come up with a job and some payments, or they go to jail. Contempt carries a possible jail sentence.
If she has been working with Child Support Enforcement, they need to step up the game. If she has a private attorney, he/she needs to get going.
Of course of the ex has a job, she could garnish wages, garnish bank acccounts, whatever it takes. I wish her the best of luck.