I'm a gamer and I am playing this game. You can attack any npc. If you made the suffragette unkillable it would be treating them different.
I like that they included her in the game. I got a surge of happiness seeing her out there.
So far they included, breifly, another story about helping a feminist from camp, and i haven't competed it yet but there is a mission about protecting suffragettes while they campaign i believe.