SELECT "Prize money" FROM table_74042 WHERE "Rider" = 'Nina Carberry'
How much did Nina Carberry win?
CREATE TABLE table_74042 (
    "Position" text,
    "Name" text,
    "Rider" text,
    "Age" real,
    "Weight" text,
    "Starting price" text,
    "Distance" text,
    "Prize money" text
)