How do you get lindsey vonn's autograph?

i really want a autograph from her i do not know what to do how to get it is there anyway i could mail a letter to her asking her for one i don't want a preprint i got one from carly patterson i waited a year for it i just now discovered it is a preprint i just want a athentic autograph and i like lindsey vonn i can't go to the olympics how do i get it please help me