Whether or not, it is you who has got file a petition under section 482 cr.p.c. for quashing the case filed under section 498a IPC. She will be sent a notice by the court to seek her opinion or objection to it. She may, on an affidavit state that owing to the out of compromise as well as the divorce through MCD, she is not pressing her complaint for which the petitioner has approached this Honorable court seeking the relief of quash. This is one step, another step is to ask her to become hostile witness by filing a memo of compromise before the trial court and the court after hearing IO shall dispose the case as either dismissed or acquitted. The latter one may be bit comfortable, you can opt either of it.
Well about going for quash after 2nd motion depends on the reliability of her version, you can decide based on the history of events took place between you two so far.