A big honking Georgia O'Keeffe show opens at the Whitney Museum tomorrow, with 130 objects documenting her abstract work. (The Georgia O'Keeffe Museum hoards 1,149 drawings, paintings and sculptures; her catalogue raisonné includes only 821 paintings and 1,137 drawings.) And some people, as they have for the last one hundred years, think this is not a worthy exhibition-pretty much because she is a lady, with lady interests. THAT WAS HER FIRST MISTAKE.