1) In DV case you don't need to attend. Only lawyer is sufficient to attend dates because it is of civil nature. Fire lawyer if he is making you travel unnecessarily. In 498a don't apply for bail etc even if lawyer suggesting, don't receive notice of police by post. Respond only if police are coming in-person to your city with a letter asking you to cooperate with investigation. Until this time, let wife bang her head on walls of police station and court to get cognizance of her case.
2) Work with a good lawyer and initiate a criminal case on your wife using CrPC 202 in your city. Usually you can make some grounds with allegations under IPC 420, 120B etc. that will be sufficient to get police notice and summons sent to wife and her parents. Once you can do this (it takes several months) half battle is over. She and her family will also have to run around, travel to courts in different city, hire a lawyer in different city etc. The game becomes on equal footing.
3) Once you can get case started in your city, wait to see which lawyer she hires in your city. Use connections to manage this lawyer and instill fear of arrests etc. Lawyers are very happy to do such things like telling their client that arrest can happen so they must apply for bail, they must attend date in person etc etc. This causes nice amount of round round running around tension and sleeping pills etc. Lawyer is usually happy to make some money from both sides of table.
4) Don't think too much about what can be proved during trial by you or her. Indian court system is not about winning or losing cases. It is only about creating sufficient ground to start a case and then drag case for decades to harass the other party via travel, legal fees and tarikh pe tarikh drama.
5) Eventually the matter will be settled if you fight back using such tactics. You may have to give some token money to this woman as compensation in the end - think of it as legally sanctioned prostitution conducted by parents of wife in collusion with lawyers.