What happens if a person does not show up to court for the final hearing on a child support case.

My husband's son was retained in 2nd grade. I am a teacher and was willing to help the child. Mother refused. My husband opened a custody modification case in 2011 to modify custody. The case was closed on April this year. The other party re-opened the case with a different judge asking for more money. We got confused with the dates and my husband showed up the day after. We are thinking more than likely we will be needing a lawyer to open another case. My husband turned in his income tax copies from the last three years and his bank account statements. My question is what could have happened? Can they give her whatever amount of money she asks for or do they have calculate the child support on whatever he presented even if he did not show up? Thank you.