She certainly does sound very anxious on walks but it's extremely difficult to tell exactly what's going on without seeing her in that environment. Have you thought about training/socialization classes? I think it best if you get an experienced behaviorist to assess and work with you privately for a session or two before you attend classes. If she's reactive/fear aggressive, positive reinforcement/associations training will work best for you both. She needs to learn both that there's nothing to fear and to focus on you.
"Education is a progressive discovery of our own ignorance." -Will Durant