Thanks a lot for the info, I've been catching up reading your thread and lots of great stuff in there i appreciate it! Valor seems like such an amazing little pup. Your recall is fantastic with him.Yes, it sounds like frustration because she's used to getting attention.
Now that she's teething, it's a perfect time to work on engagement using food. I would say no more attention from strangers or strange dogs. They should be like furniture. Focus is on you. 200% engaged with you. You have to work outside threshold, which you described well.
I'll shoot some video tomorrow morning in the park of how I work on this. If you haven't seen it, I have a video of some of this type of work. Pardon the first half of the first video. Terrible camera angle.