Both my H's exes were fine, one actually became a good friend of mine, the way I see it is we already had one thing in common. Was I nervous when I met them? A little. I remember I played it cool, stayed quiet (my nature anyway).

Keep it light is my advice, try to forget what you've heard about her (people will have their own agendas and biases).

As for your anxiety, what power does she actually have over you?