She won the Pulitzer in 1923, but when newspapers recounted her public readings, they more often focused on her outfits than her writing. Her glamorous and occasionally scandalous life made her a celebrity, but her celebrity (along with other trends in literary criticism) led to charges of intellectual shallowness and political dilettantism.
Over at The Toast, Laura Passin writes that poet Edna St. Vincent Millay was some sort of literary Beyoncé at the beginning of the 20th century.