If she likes Risk, she might like Settlers of Catan as well. Its also a good excuse to get friends to come over since the more people you have to play it, the more entertaining it gets.

The game itself costs $40-50, you only need the expansion packs if you want to have more than 4 people play or you want to expand the base gameplay with some additional stuff, otherwise you don't need anything beyond what you get with the main set. I highly recommend it.

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