Prohibition — Prohibition is not the appropriate mechanism to test correctness of trial court order where trial court has both subject matter jurisdiction and personal jurisdiction over the defendant — When trial court issued default judgment against petitioner’s co-defendant, the default judgment was not effective to terminate the cause of action against petitioner who was not served with process until after judgment was rendered — Mere entry of default is not the equivalent of a judgment, nor is it a final disposition — Guardian can proceed against petitioner to recover funds alleged to have been wrongfully obtained by petitioner and her co-defendant