She is entitled to withdraw the case and your visitation rights go into thin air and you cannot protect them. Even so, you move application that you have no objection if the hon'ble court
(1) direct the petitioner wife may please continue the compliance of visitation rights granted to the respondent husband even after withdrawal of the case
(if the court refuses to accede your prayer), alternatively
(2) direct the petitioner wife to continue the compliance of visitation rights till three months by that time, the respondent, if choses so, would file a custody case under GWA and interim application for visitation rights.
These are some steps you can take. But the right stepis that you have to file GWA case for custody of the child and seek visitatin rights by enclosing the certified copy of the visitation rights granted to you by the DV court. There are more chances that your would get ad-interim ex-parte visitation rights in GWA case once the judge sees the visitation order passed by the DV court.