Ca. Child support arrears captured state refund why?

I filed married joint return with the new spouse. I am in arrears with my child support from previous spouse. I was unemployed all of 2010 and did not have a state taxable income, child support was taken from my unemployment benefits. My new spouse and I owed federal taxes but due a refund from the state primarily due to property she owns ie property taxes and home owner deductions. I filed the 8379 innocent spouse federal form and the state 705 form yet her refund was captured why is that?