

I fear this has the potential of becoming the copied standard unfortunately. Fear of terrorism is like think of the children. All it will do is force people who need visas into having squeaky clean innocuous public profiles and operating anonymous accounts with actual opinions. Terrorists will do the same. So this privacy infringement will only catch really dumb people.
I don’t think you did anything wrong. I hate people striking up a conversation like that as well.
You can train yourself not to panic, deep breaths, focusing on something in the middle distance, closing your eyes, counting to ten - whatever works for you. And then you can ride a situation like this out. Either by masking your discomfort or giving very curt replies. You can also just say “I’m very sorry, I’m not in the mood for a chat.” But you mustn’t worry that you made an extrovert sad. She’ll get over it and maybe learn from this experience as well.