Sorry that happened. WAs it you who posted a similar concern a month or so back? It sounds like exactly what you said, Gigi spooked, the lady frightened her. Can you describe more fully what happened? Did you have no idea the lady was going to do that?
No, it doesn't sound like any kind of aggression to me. It sounds like a fear reaction. If strange people are going to suddenly stick their hand in your dog's face and she's going to react like that I think the best thing is to just give everyone a wide berth. In our CGN classes and test dogs must greet a friendly stranger but it's up to the dog owner to make the dog sit while people talk first. Actually, I don't remember if the strange person got a pet or not but there is no reason for a stranger to pet your dog any more than pet your child.