What is your problem or what clarification are you seeking?
Instead of just contending with the legal notice, you should have filed an eviction suit against your son who is the tenant and has defaulted the rental payment for the last 18 months.
If she has filed DV case against you, you have to challenge her grounds of grievance against you accordingly.
You should know that your DIL is the wife of your tenant and not directly your tenant. In fact she is residing in her matrimonial home and is entitled for residential rights, therefore your action of issuing a legal notice to her to vacate the premises is unlawful.
The court will take its own time for disposal of case, it cannot be decided in the time stipulated by you, also you cannot issue directions to court to dispose your application within 30 days. You have to wait for the court's decision.