The woman, who has not yet been identified, was able to cross ditches and climb fences to get into the elephant pen.
The incident was captured on video by another visitor to the zoo.
As she walked up to the elephants, onlookers screamed at her in an effort to get her to leave the enclosure, which houses three elephants.
Zoo staffers also urged her to get out. She left voluntarily, climbing out the same way she got in.
-- KTLA News