Grace and charm?
I honestly doubt it. Not suggesting she lacks them, just that she'll be remembered in history for having them.
Think about the 41 other First Ladies we've had. Maybe four get mentioned - Dolly Madison, Mary Todd Lincoln, Eleanor Roosevelt, and Jaqueline Kennedy.
Madison for actions in the War of 1812, Lincoln for being nuts (helps that Abe is famous), Roosevelt for policy influence, and Kennedy because of media infatuation. It's not a knock on Laura Bush, but I don't see her making history books.