Reactivity

I have a 3-year-old mixed breed puppy; we got her when she was 3 months old and we think she may have been treated poorly before arriving to the shelter we got her from. She's incredibly well-behaved overall but we've never been able to get a handle on her barking. When she sees another dog, either from inside our apartment or on a walk, it's like she loses her mind. We’ve tried redirecting her with every kind of treat and incentive imaginable but she is so laser-focused on the other dog(s), it's like she can’t even think about anything else. The only thing that sometimes works in physically grabbing her muzzle and directing her away which I hate doing. Any advice would be appreciated.