Re. training to fight - very difficult to do, I would think.
This is a bit off-topic because we're talking about women (who just are less violent than men - largely socialisation, but possibly innately so), but it's interesting to consider the fact that it's actually quite difficult to get ordinary men to be violent, as can be seen by looking at what goes on within the military. A lot of military training is down to not just teaching people (predominantly men) the techniques of fighting, but breaking down their reluctance to do so - this is actually what a lot of the brutal "hazing" in basic training, tacitly tolerated by officers and NCOs, is about.
I remember listening to a fascinating radio documentary a few years ago. Most soldiers are extremely reluctant to cause injury to another human being. Typically they'll do things like "provide covering fire" (aka deliberately fire over the heads of oncoming soldiers) or pass the amunition to the one guy in the unit they know will actually shoot people. That way they can feel useful without actually having to be violent themselves. The programme had a number of interviews with ex soldiers, trainers, military historians - and the take home seemed to be that yes, you could train people (men mainly) to suppress their natural instinct not to hurt others, but only at huge cost in terms of (a) PTSD when they left the military and (b) the risk that you'd created a highly dangerous, undirected weapon who was as likely to go on an unpredictable violent spree against his comrades/family while home on leave/random member of the public who looked at him the wrong way in the pub closest to the bases as he was to kill the people you actually wanted killing.
My own personal experience is I tend to be a talker - defuse the situation verbally, talk him down, distract him, make him mentally shift you from "potential victim" category to "my mate's sister" category. I have on occasion flipped into fight mode - as others have said upthread, it's not a choice, it's pure instinctive reaction in that situation at that moment. And I think (Gavin de Becker style) that subconsiously what we think of as instinctive reaction is actually a fairly accurate self-preservation mechanism, and our instincts read quite accurately what is likeliest to work in this situation, faster than our conscious brain could. I'm sure the freeze response is an instinctive reading of the situation as "this is one of the really nasty ones who could kill me if I don't go completely unresponsive."