1. On the basis of false statement made in the complaint of 498A IPC , no case of perjury lies. However against her false statements made in the suit for nullity , you can file such petition.
2. Unless any crime is committed against you , no complaint for registration of FIR can be made against them.
3. You can file perjury petition simultaneous with your written objection.
4. Do not wait for interim hearing. Rather while filing the perjury ask the court to first dispose of your petition before hearing her interim petition for maintenance.