What is the sum of the to par of player meg mallon, who had a total greater than 157?
CREATE TABLE "missed_the_cut" (
  "player" text,
  "country" text,
  "year_s_won" text,
  "total" real,
  "to_par" real
);
SELECT SUM("to_par") FROM "missed_the_cut" WHERE "player"='meg mallon' AND "total">157;