effect of women involvement in violent crime.

I have been working on this topic. the involvement of women in violent crimes. I'm trying to get a broader perspective on why there has been little involvement of women in violent criminal activities until the late 20th century. where there has been a steady rise. I do believe finding the root cause of why women don't commit the crime in the same level men do is a step towards reducing crime committed by men. I just want to get your minds on what you think are the effects of women involvement in violent crimes.