You need to train her not to jump up! Always keep her on a leash when she is going to meet new people, and if she seems like she will jump up, keep her on a tight leash so she just can't! Teach her "down" means all four feet stay on the ground! Don't let her jump up on you, if she does, step back and say "no!" then ignore her for a few seconds.

What breed of dog is she? How old is she?