Well since i have 2 very large aggresive breed dogs, i can say that i would never ever walk them together at the same time, each of my dogs weighs more than i do, and i imagine 2 large dogs together weighs more than most women, she should be walking them seperate and muzzled if they are that aggresive she cannot control them and has to warn others to run.
Also in my opinion i would never walk my dogs off leash, and they are voice controlled and very obedient, but they are still animals and i would never want to be responsible IF anything were to happen at all.
I guess i am saying i think she was wrong, and should go muzzle her dogs if there that aggresive.
Oh, and your dogs are gorgeous by the way!