I tried to to use the things you guys have suggested here, not directly talking about doctrine but using my family's experience. Appealing to emotions seems to work better people say and it did stop her running to the hills immediately screaming apostate.
It did get to me when she talked about her daughter giving up her career for her faith, another young life down the drain. I hope something I said made an impression on her.
I haven't been brave enough to talk to the cart people yet like some of you, I did too much talking about religion on the street in my twenties but seeing as she walked up to me I thought I'd have a go.
Freddo, thank you.