Who was Betty's partner when the surface is hard?
CREATE TABLE "women_s_doubles_14_6_titles_8_runner_ups" (
  "outcome" text,
  "year" real,
  "championship" text,
  "surface" text,
  "partner" text,
  "opponents_in_the_final" text,
  "score_in_the_final" text
);
SELECT "partner" FROM "women_s_doubles_14_6_titles_8_runner_ups" WHERE "surface"='Hard';