I'm sorry your pup is having such a hard time. It's concerning that your pup is having such difficulties at such a young age. I suggest consulting with a board certified vet behaviorist.
Once a dog is dog is displaying fearful behaviors, it's too late for the regular kind of socialization that puppies get. I suggest not doing the puppy parties right now nor the group obedience classes. A vet behaviorist, with the help of a good trainer can set up some calm one-on-one sessions, keeping your pup well below threshold. If your pup does well with one-on-one sessions, then you can start expanding her circle of friends - but only with carefully chosen, calm, tolerant dogs.
If she is slow to perform tricks, she is probably stressed or feeling pressured. I'd work with a good trainer on super short training sessions. Make sure all training is hands off and that training starts in a distraction free environment. Use super tasty (to the dog) treats. Also look into online training classes.
See links below (includes info vehicle fears) that you can discuss with your vet behaviorist)
Classical Conditioning Videos : https://www.youtube.com/playlist?list=PL70eA_MZvAVoG4wVvh0DaIRBvYpZLW7M0
Classical Conditioning Blog Posts: http://www.stubbypuddin.com/search/label/classical%20conditioning
Too Late For Socialization: http://www.stubbypuddin.com/2013/05/too-late-for-socialization.html
Fear of Cars: http://www.stubbypuddin.com/search/label/vehicle%20chasers
Shy Dogs: http://www.stubbypuddin.com/2013/09/how-do-i-fix-my-scared-and-nervous-dog.html
Stress Reduction: http://www.stubbypuddin.com/2013/12/stress-reduction-for-behavioral-issues.html
This post is about deprivation in dog training but it also lists possible reasons why a dog might not be motivated: http://www.stubbypuddin.com/2014/07/deprivation-in-dog-training.html
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