Nothing, but it's bad politics. Remember Tereeeza's remark, after the floods in Pittsburgh? "They don't need clothes that badly--they can always go naked for a few days." True, I guess, but very dumb thing to say.
Barbara Bush is not the First Lady, nor presdient. She is a private citizen donating her time, money, and energy---sha has done far, far more than the vast majority of Americans to help our fellow citizens.