Human and dog aggression are completely different. A dog might want to kill every other dog it sees, but could be great with humans.
I would just keep a very close eye on her when she's around new people. If you think she's starting to act different or nervous, just remove her from the situation. She's just starting to mature into an adult and her temperament might be changing. Try to keep everything as normal as possible for her, but also keep a close eye on her behavior. Most dogs will give warning signs before an attack or bite. A deadlock stare is a warning sign of something.