get DV complaint copy and go through what she wrote.
if events similar to 498a then go for quash, as she cannt file 2 cases based on same events.
also check for the place
if all of the accused stayed with her at that time, then ask court to submit proofs of that she was with you at that time.
there are many ways to counter every case.
let us know what is there in FIR copy
meanwhile go through many judgments on 498A/DV here http://mynation.net/docs/sitemap/ for your information.