We live in a western secular society subject to legal rules and norms, some of which may conform to halacha and Torah and others that don’t. There already are frum Jewish women serving as judges in the state and local court systems. We have frum jewish women litigating in the federal, state and local courts. Protection of omen’s “rights” under secular law (not as you would define them per halacha) benefit from having women in the role of advocates and adjudicators at every level of the court system.
In a larger context, not all disputes can or should be settled in a beis din. Some well known cases of physical and sexual abuse were forced into secular courts as a result of a time when batei din were paralyzed in their dealing with these types of accusations. More frequently, parties to a psak din simply won’t accept the outcome or cannot even agree on the proper forum
edited