CREATE TABLE table_204_975 (id NUMBER, "year" NUMBER, "competition" CLOB, "location" CLOB, "event" CLOB, "final-rank" CLOB, "final-score" NUMBER, "qualifying rank" NUMBER, "qualifying score" NUMBER)

what was the only event that she participated in the vault ?
SELECT "competition" FROM table_204_975 WHERE "event" = 'vault'
SELECT "competition" FROM "table_204_975" WHERE "event" = 'vault'