1. There is no procedure for ex-parte divorce as it is an exception and not rule.
2. The court fixes date for ex-parte hearing of a suit when it becomes satisfied that the other party in sipte of receiving the summons ahs failed and neglected to appear in the suit and contest the same.
3. In your case if you can show the court through postal receipt and track report that the summons has been received by her in Italy but she has not been contesting the suit then the court may hear the case ex-parte hearing of the case.
4. In ex-parte hearing also, you have to prove the allegations against her so the court grant decree of divorce in your favour.