Darlene Singh was last seen leaving her parents' home at 7 a.m. Tuesday, taking a taxi to the Hayward BART station. Her family thinks she took a train to Oakland.
Her final communication came in the form of text messages with friends at 10:30 a.m.
Darlene is 5 feet 4 inches tall and weighs 100 pounds and is said to suffer from social anxiety disorder.
Call Hayward Police if you have any information.