File a motion to be allowed to amend your answer to add a counter complaint for divorce, then allege the facts necessary for a divorce, i.e. irreconcilable differences, abandonment, etc. Once the court allows you to do that, file your amended complaint, serve it on her by sending it to her last known address, then file for default and default judgment.
Answered on Nov 26th, 2013 at 6:55 AM