I don't remember where, but I just read an article about dogs going through their terrible teens. It was referring to about one year old and how they suddenly start challenging things and trying to be their self. Maybe (hopefully) it's just a phase.

I would continue to socialize her with dogs so it doesn't get worse. Perhaps use a muzzle until she gets better. Get her a pinch collar if you don't have one already. They don't hurt the dogs, but it'll certainly get her attention if you snap her leash when she's trying to get into a fight. Give her a sharp "NO!" to let her know you don't like it.

Also, don't make the mistake that I made...I used to pet my dog and coo "It's ok, puppy...that's a nice doggy...blah, blah, blah" My dog trainer told me that by doing that, I rewarded my dog for his aggressive behavior.