You need to tackle this case other way round. Since she is the deserter and has left the matrimonial home, deserting you, without there being any just and sufficient cause, she is not entitled to a penny. You need to file a reply saying that she is the one who has deserted you and show your willingness that you are ready to accept her back and bear her full responsibility in the matrimonial home.
Instead of straightway filing a divorce petition, I will advise you to file petition for restitution of conjugal rights. You need to tackle things in an indirect way, so that you retain some bargaining power at any time there is a out of court settlement in this matrimonial dispute.