Ask what she did on the weekend. That's always a good place to start. If she saw a movie, start talking about movies. If she went for a meal, start talking about food. If she went to another state/town to see some friends, start talking about some of the places you've been to before and ask her about some of the places that she's been to.
Sounds like it went before though so you seem to be on the right track.
Hope this helps
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