Intentionally hitting a batter because the batter is the other teams pitcher or because this player has already hit two hard shots to the fence or because the player crowds the plate is WRONG and uncalled for.
but consider this example:
Batter pops up down the first base line... the first baseman comes over (looking up to field the ball) calling out "mine". The batter / runner takes off down the line, lowers a shoulder and takes the first base out... I mean out... girl is laid out. The batter is called out for interference but in no other way reprimanded for the "crime".
Now personally, if I was on the mound, one of two things would have happened. The next girl up would get a fast ball in the back or if the game is in the early stages and I knew I would face this girl that ran over my first baseman again, I would wait and hit her. Right or Wrong... it would happen. Rule one. Protect your own.
After the event above... did it happen. No. I think it requires a girl with a little bit of the "dark side" in them to go out and purposely hit a batter. Obviously the pitcher on the mound did not have the "dark side" in them or maybe they just didn't care about their first baseman (hey! I have others!)
I know... "two wrongs don't make a right"... you don't need to start preaching to me. But consider this...
If the pitcher came back and hits the next girl hard... a STATEMENT pitch. It would simple say... "There is a cost to your actions. You keep it up and I will keep plopping you!"
Just maybe this might avoid a worst injury later in the game. This STATEMENT pitch kept your third baseman from getting cleated on a high slide because the other team understood dirty play receives worst payment in return.
Now clearly if the umpires take over the game (i.e. the girl was ejected) then there was no need to provide a STATEMENT pitch. But if there was no consequences to the action (i.e. the girl was called out but she was going to be out anyways) then it is up to the pitcher to communicate to the other team that this type of actions are unacceptable and will not be tolerated.
ONE OTHER THING: NO COACH SHOULD EVER TELL A GIRL TO HIT A GIRL. IT IS UP TO THE GIRL TO FIND THE DARK SIDE. A COACH SHOULD NEVER FORCE A GIRL TO HIT ANOTHER GIRL.