I have an international student friend who needs to find a host family for Christmas - any suggestions?

My friend is currently living in campus housing. While her residence hall is open through the christmas season she is looking for a place to stay with an American family over winter break. Are there any websites that will connect her with a good host family. Do you have suggests for any alternative ways to find a family?

This is for Missouri.

Thanks!

email me with details. I like in Kirkwood, a suburb of St. Louis