I used to say I didn't approve of Petsmart classes - but I attended one just to watch and I think it provides great training in a good environment with distraction, which is what dogs need to proof their training.

I would be extremely concerned about her if she is growling at 10 weeks old. Definitely get into classes ASAP, and don't stop after puppy classes. Continue on with her at different levels of obedience. Also, remember to bring her MANY different places SEVERAL times a week where she will meet lots of new people (not the same people over and over!) and animals.