It is not important if allegations are made against you or not. What is important is whether you are a party to the DV petition or not. If you are not, then the Court cannot pass an interim maintenance Order or Residence Order in her favor as in-laws are not responsible for any of these issues/claims. If there was no "domestic relationship" for a decade or so then the DV petition should fail on procedural or limitations ground. You/your-family should focus on that (and not on substance or allegations in the petition) in the appeal.
As you have filed for a divorce, you can tell the DV-appeal court that the dismissal of the DV does not prejudice her as she can seek any relief she wants in the Family Court where the divorce petition is pending. Emphasize the need for judicial efficiency and avoiding multiplicity of proceedings.
I wonder what is the basis for your divorce petition... In any event, the DV-Court (presumably the Magistrate) has no jurisdiction over the divorce petition and vice-versa. Therefore, at most one Court can take notice of parallel proceedings but cannot rule on the other or influence the other. Generally speaking a civil Court order acts as a bar to a criminal proceeding (for same allegations and based upon the same facts) but not vice-versa. DV is arguably criminal but more quasi-criminal.
Once you enter the court system and lawyers get involved, the money tap cannot be closed that easily.