In my years with pits i have seen the same pattern. females are more aggressive then male. even more so after a litter. my best addvise would be to keep a close eye on her. pits arent like other dogs due to there remarkable speed and stregth. its like haveing a 6 foot 200 pound 9 year old child with a temper. and they can be very strong headed not untrainable just takes a little more attention. just keep a close eye and correct when needed.(do not slap or hit) just encoureges aggession. spray bottle works great…..