We're also going to need to get your girl on a strict regimen of exercise. I understand that you have a busy life and things to do, and that you already do give her a good amount of exercise, but working breeds like herd/guarding dogs NEED to be exercised every single day, and I'm talking more than a quick walk around the block. A youngster like yours needs a couple miles or more a day to drain her energy and keep her from getting into trouble because she's too wound up. If you're unable to walk her yourself, you might want to consider hiring a pet walker. In my neighborhood, I live close enough to the colleges that I put up fliers at the schools and hired some of the track runners to take my dogs for a run on the days I can't. I pay them $10-$15 bucks a day, and it really, REALLY works. The dogs get the exercise they crave, and the students get a couple bucks in their pockets for doing something they would have done anyway (the running). Several of my runners say that they feel safer running some of the woodsy trails around here because the dogs 'look' scary enough to ward off anybody who might bother them (luckily the strangers don't know that my dogs are all big marshmallows!!).
Investing in a backpack for her to wear on the walk will also help. It can carry your keys, water for you both, poop bags, whatever you like...the added weight will help tire her out faster than if she was just walking without it.
Also, you might want to consider clicker training your dog. This involves buying a 'clicker' which has a little metal plate in it. You press the plate and the thing clicks, then you give the dog a treat immediately. Soon, the dog learns that if she focuses on you when she hears the click, then she'll get a treat. It can often help when trying to get them to pay attention to you, rather than what is outide that window. You can see more about clicker training here:
I know you don't want to use a shock collar with her, and I tend to agree with that kind of thinking...however, we could try a new product on the market called InteroStop. I've found that it's a nice product that seems to work well. It essentially combines a pheromone with a noise...you can read more about it and even buy it here: http://www.amazon.com/InteroStop-InteroSTOP-Noise-Interomone-Spray/dp/B009IUQMS2
Thank you so very much for your advice, I can't wait to start working on this. You provided so much good information I very much appreciate your time with this and giving me some hope! I too live by a college and that was a wonderful idea, on the days that I walk her I will use a backpack. Hope to have a good report on this soon!