There are lots of others on here which will recommend multiple suggestions that will work but have you ever tried different kinds of leads(harness, the face control collars, the pronged collars, etc). I have two boxers, Duke pulls and always has, not to go after anything, just to walk at the end of the lead but after awhile it bothers your arm so I bought him a pronged collar. I know a lot of people are against it but I believe it works. Duke pulled the first time it was on, it pinched, he did a quick yip, he stopped pulling and now is very well behaved on the leash. I do not even have to put that collar on any more, just a regular collar will work. There was also a suggestion on her that one PTer was using with her pulling dogs was that when they pulled quickly change directions, if they pull again change directions, each time they pull, the dogs apparently got the idea and were much better behaved on leads. Dobbies need regular exercise, high energy working dogs, so yes maybe she is the wrong dog for you. That doesn't mean you don't love her but maybe there is a better suited family for her that can give her the constant attention, correction and exercise.

Try getting a one on one training that can come to your house and observe her behavior and your techniques. If all else failed my suggestion would be to find her a loving forever family to give her what she needs. JMO.