Female bulldogs can be real buggers... some are very dominate and can not co-exist with other females. Banks was like this and we used a vibration/shock collar with her. She was a 9 yr train session... we could not let up I centimeter or she would take those 10 miles.
The collar is a good tool, but you have to know how to use, please make sure you get a trainer to help you --- timing is EVERYTHING, I can not stress that enough. When to vibrate or shock makes the difference of it preventing or causing more problems. Example, if you vibrate/shock her when she is 'fighting' or engage with one of the other pups, she may relate it to them and not the collar. You have to ping her BEFORE she engages... learning her tiggers and body language is totally the key, if you do not know those things, the collar might not work.
The collar for us was a last resort, but we did not have children in the home.... we did almost a full year of training before we relented to the collar. We used it with Banks from the time she was 2 yrs old till she past. After a few years, all we had to do was place the collar on her, it was not even active, she just knew... 'crap, they are on to me... and she stayed in line'
Ask away.... more than happy to help you. But, PLEASE bring a trainer in to help you learn to use it, if you have already decided to do so