Does my dog think she is in charge?

Hi, we have just adopted a three year old dog, four days ago; I know adopted dogs may not fully show their personality the first few days. She obeys basic instructions like getting off the bed and couch and knows not to put her paws up on the table. The main problem is during walks, i have taught her not to pull and she doesn't anymore, when she is unsure where we are going she looks at me for guidance, she tends to bark at other dogs and im correcting that, i do a "shhhht" sound (cesar milan style) and tug the leash and she gets distracted, now when other dogs bark at her she is able to ignore them (with my corrections), today i let her near a dog, because she did not bark and was calm, (although she pulled a little) they smelled each other, but they were both very edgy and scaredy and when they put each other face to face and the excitement levels raised to much i ended the interaction ( i read face to face is not good) neither dog barked or growled and i believe my girl just wanted to play as she did the thing where she bends the front legs when she was face to face with the other dog.

Then i started noticing her tail during the walk is upward and curved and i read this is her saying she is in charge, im not sure now if im walking her properly, at home she is submissive i can touch and move the food bowl at will, she often offers her belly, she no longer "jumps at me" and just sits when she wants my affection and respects the no-dog spaces.

I was gonna give her a treat today after the interaction with the other dog but a loose dog showed up and went up at the other dog (while we were leaving) and the owner was scared while the second owner came running saying his dog was ok, all this commotion scared my dog and i was unable to give her a treat at the proper time, so i did not as i didn't want to feed the scared mentality.

So is the tail thing just a thing i shouldn't care about? And about the interactions with other dogs any other tips?