i only remember a few. its in the book Grrr by Mathew margolis. anyway 1-put your dog on his spine and hold him there while you're standing over him, if he tries to bite, hes aggressive
2-call his name and look straight into his eyes--if he lunges towards you, hes aggressive
3-tug on his skin and tail and lips, if he bites-then hes aggressive
and thats all i really remember.
www.unclematty.com has some cool pages about aggression.
i totally doubt your dog is aggressive. if she's shy then the trainer will totally help you about sociallizing her more.