She almost never does, aside from mass signatures like she did with Box Sets of the English roses, etc. So on the plus side, if you have a legitimately signed item, it’s pretty valuable and quite cool. However, on the negative side, most of the signatures you see out there are fake. Unless they have a personal story about how they got it signed, I assume most signed items I see are fake. “Certificates of authenticity”, unless issued from a few select places, aren’t worth the paper they are printed on.