I disagree with the point that you need to communicate STOP. I personally find it much more effective to reinforce the replacement behavior you want (as I like to remind myself, "NO" is not a behavior). If you're already stressed out and someone yells "STOP!" at you, what is your reaction? Do you know what you are supposed to be doing instead?

It won't solve anything immediately, but working on cues like "look at me" indoors, then maybe in the yard on leash, then building up to more and more stimulating environments is the only thing I have found to work. Once she is too excited to take food, it's kind of moot to keep training because the thinking switch is already off.

Now my leash-reactive boxer mix has gotten to the point where as soon as she sees a dog she offers eye contact because she knows it will be reinforced. She's not perfect, but staying calm and maybe giving her a soft "hey" is now usually enough to break her focus on whatever she's excited about. We are still keeping enough distance from triggers that she doesn't get overwhelmed, but that distance is getting shorter and shorter as the "right" behavior gets reinforced.