Bynes, 27, will now remain in the psychiatric hold for two more weeks, reported E! News.
The actress was placed on a 72-hour-hold on Monday after accidentally starting a small fire in a man's driveway near her parents' house. It is not clear why and when she arrived in California from New York.
Rick and Lynne Bynes are expected in court tomorrow morning to request a temporary conservatorship that would place them in charge of their daughter's legal and personal affairs.
Bynes has been in news for her frequent run-ins with the law. She is currently charges of reckless endangerment, tampering with evidence and criminal possession of marijuana for allegedly throwing a bong out of her apartment window.