Well I think we're all agreed that letting her find you was a bad idea, it could have really caused a lot of problems and made things a lot worse.
Sarah's idea about a meal is a good idea, it doesn't have to be a big elaborate thing, just somewhere you can talk to each other, if that doesn't appeal then do as Di said and cook a meal at home.
You know she could be waiting for you to say something, maybe she wants to but doesn't know how to start off, things like this aren't easy but getting things out in the open are a lot better than keeping it bottled up.