If my friend loses her house, can they take my Mexican cafe that is family owned and operated under my name?

How does your friend's foreclosure effect your business? There is not enough information to answer the question.

There must be some important piece of information missing from your question. It is not apparent why the cafe under your name would have anything to do with your friend's house. Having said that, in Wisconsin, most foreclosures of HOMES result in no deficiency balance and therefore there would be no reason for the creditor to go after the homeowner's other property, but again there is not enough information here to answer your question or to be certain your friend would fall into this category.