If you don't mind, I may say that if both made 2nd marriage that clearly reveals that both of them, not being aware of the importance of mutual trust and faith between the husband and wife, had not been accommodative to each other by nature.
Better try to get patch up to lead them the life of trusted husband and wife by compromise with each other.
Just give a serious thought, when she gets divorce 2nd time also and be desirous of 3rd marriage, what would be her position for rest of life? Would she or any of you be able to justify the thappening of two events of divorce in such a short spell of her married life? What will you do, if her 3rd marriage proves to be more devastative? Will she continue to file 498a cases every time wherever she would not be able to adjust on remariage after remarriage?
Better realize the relities of life. 498a cases cannot prove to be lucrative every time, if proved so earlier.