Hi,
Your dog is obviously not stupid. She is very young to have learned how to make people leave her alone which is what she wants due to her past experience.
Training is the way forward although a class would probably be counter productive for her. She is still a baby and this has to be overcome soon to give the dog a decent quality of life. I would love to help you but this is a problem that needs serious one to one training for you both. Ask at the training class if anyone knows of a dog trainer that can help, try your local shelters and ask at local pet shops. Good luck, she is just a frightened baby and needs to learn the limits of acceptable behaviour. You need to learn how to give her the confidence in you as her pack leader - it's a challenge that you should give serious thought to. She may be better off with someone more experienced. If you decide to go on with her you will learn so much and have a fantastic relationship with your dog, but proffesional help is needed here. Again, good luck and let us know how you get on.