Bastian was last seen in Apple Valley, California on November 1, 2015. She was supposed to stay the night with a female friend, but got upset and left her friend's house at 1:45 a.m. with her small tan and white dog, a Maltese/poodle mix named Cocoa.

That same night, the California Highway Patrol found some of Bastian's belongings on the road near Highway 247 and Bodick Road in Johnson Valley, California. Later that same morning, her silver two-door 1500 Dodge Ram pickup truck, which she had only owned for a week, was found abandoned near Valley View Road and Twentynine Palms Highway in Morongo Valley, California. It had dents and scratches on both sides, as if it had been driven over rough desert terrain.

On November 11, someone found a backpack containing Bastian's belongings on a dirt road near Bear Valley Road and Central Roads. A search of the area turned up no further evidence.

An Apple Valley woman found Cocoa near the intersection of Bear Valley Road and Highway 18 on November 1, the same date Bastian disappeared, and took her home with her.

However, just a few days before she disappeared, she told people someone had broken into her apartment on Laguna Road in Apple Valley. She began acting paranoid and erratic after the break-in, and was too frightened to remain in her apartment. She took some of her most precious belongings and left to stay with others.

Bastian's family believes she may have decided to walk out of her life, but because of her mental illness and because it's uncharacteristic of her to leave without warning, they're concerned for her safety. 

They stated she enjoys writing fictional stories and is a devout Christian. Her case remains unsolved.