You do not say what culture she comes from and how different it is form the one she is familiar with. She could be suffering from 'Culture Shock'. Google it. It is a complex condition felt by some people when they move from one culture to another and can last for months, some people cannot cope with it and return to their home culture.
It is quite reasonable not to want to meet other people just because they are from the same culture, they may have absolutely nothing in common with each other apart their origins. Imagine yourself in her position in a foreign country and someone says you should get to know someone just because they are British, it doesn't follow that you have anything in common and that you will not loathe each other on sight.
Your DS is the one to talk to his wife and support her through the transition phase. You need only stay friendly and welcoming.
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