My Neutered Boxer/Dobie Mix Got in a Big Fight With a Female Boxer/Pit Mix When Introduced?

I just got a 6 month old Brindle Female Boxer/Pit Mix She is Hyperactive and Not Fixed. My oldest I got from a Rescue His Name is "Brewski" I was told from the Rescuers that he is a fawn colored Boxer/Dobie Mix and they had to neuter him and give all his shots in order to adopt.He is 8 yrs old now.Last yr.I found him a buddy which he is also neutered too.He is an Australian Shepherd/Boxer/Bullmastiff Mix but some think he may have some pit in him too.The first day I introduced her she attacked "Brewski"after she ate her dinner, I put her on the leash and made a bed in my bathroom to calm her down.It not fair to her because she is now not with any of my male dogs.She gets along Fine with "Chance" My Mastiff Mix but I seriously don't have a clue why "Brewski" Can't like her at all,after this happened I seperated the two males and let them in the living room one at a time to be with her to see what would happen.Brewski gives her a mean and dirty look and walks away while chance wants play with her.Previous Owners told me she doesn't like when other dogs get in her food,so I guess Brewski Remembers her chopping at his throat and that when I grabbed her and placed in bathroom to confine her.I would feel so bad to give her to somebody else because taking her to a sheltor or calling animal control would put her to sleep because of her territorialness,she followed me on my 21 speed bike the other day walked 4 miles hoping maybe she would calm herself down,wrong! my best friend that in wheelchair she freaked out barked and jumped up on him like she was going to attack.Friend said this not good and maybe you should find her a new home.What Should I do? I'm not the type of person that gives up but maybe it's something to do with the Pecking Order,Maybe 2 Neutered Males Can't be With a Female.Somebody Out There May Know, Maybe Caesar Milan "The Dog Whiperer" Would Know. She a Very Pretty Dog and they Paid a lot money for her despite her mix $600.