As a former Army Infantry squad sergeant, I doubt she is leading. Occupying the slot and filling the parade duties, but “leading” ... you cant lead if you cant do.
In my experience, women cant do the duties of an infantry soldier. It requires a hell of a lot of upper body strength to do things like, setup a M2 .50 caliber machine gun, dig fox holes, transport a wounded team member, even humping a battle ruck. And it is not sexist to say so.
Marine grunts were the uncultured warriors of the culture.
This woman knows nothing about the military, but I know that you are right.
I have always been Army Infantry and women absolutely should not be in the Infantry. It’s like trying to use SAW 5.56 in a M2 .50. Even support units with women have been problematic. The biological factor alone is unsuitable physically, mentally and emotionally. The physical weakness in women is obvious but the mental and emotional make up of men and women together under stress is not conducive to combat. That’s not sexist but reality. I could not imagine a woman Infantry leader let alone a squad/platoon member in Ramadi or Fallujah. Social experiments have no use in the military. There is no shortage of men who can be in the Infantry.