Someone at my job is bringing homemade cookies to work next week...?

The thing is, is that I really don't think they are really that sanitary because I see how unclean, and nasty she is when she comes to work.. How can I avoid the issue of eating the cookies without hurting ther feelings? I really don't trust to eat from just anyone, especially if you don't look like a clean person. What would you do? She's been talking about the cookies all week, and asked what kind was my favorite, and that she will bring a special batch of the ones I like.. I really don't want to mean..