If divorce papers state child support stops at age 18, can it be lengthened by a judge?

Minor moved to GA to attend high school, custodial parent lives in FLA, divorce was in GA. Child support was legally stopped. Minor moved back to FLA, child turns 18 in 2 wks, graduates high school in 9 months. Custodial parent wants to continue support until June. Papers specifically states 18 years of age, not until end of primary education.