If a victim doesn’t show up to court for a protection order will the case be dropped?

Yes, if the person who obtained the civil Temporary Protection Order ("Petitioner") does not show up at the Permanent Protection Order Hearing (normally set about two weeks after the TPO is obtained), then YES the Permanent Protection Order cannot enter and the TPO will be dismissed.  However, if you are talking about the CRIMINAL protection order attached to a criminal charge against a person, then there really is not a second hearing, the court is attempting to protect the victim and the Court will decide what to do (although it can modify the order if the "vict5im" requests it).