she can always file an application under Order 6 Rule 17 of CPC to amend her divorce petition.. but remember one thing.. she cant delete anything.. only she can add something new,, that only if she is able to convince the judge that these amendment is necessary for the proper disposal of the divorce application filed by her,
judge will give you opportunity to file your amended WS in light of her amended petition. and if she already file her replication to your WS, then she also have liberty to file her amended replication.
of the oposite.. you also file amendment application for ur WS if you got some proof in 498a case if she is not willing to file her amended div application,,, normally judge allow these application on the cost of Rs 500/- for either side.