The mother of a missing 15-year-old autistic girl has made a desperate plea for help after her daughter disappeared while out walking a week ago . Teenager Kimberly Greenberg became angry and left her Santa Monica home to calm down about 8.30pm on March 24 , but never returned . Her mother Janice Greenberg has now made an urgent appeal for help as the teenager , described as having the mental capacity of an eight-year-old , has gone missing without her cellphone or medication . Kimberly Greenberg , 15 , disappeared more than a week ago after going for a walk near her Santa Monica home . The autistic teenager left her home without medication or her cellphone and has not been seen for a week . She told NBC Los Angeles that she adopted Kimberly eight years ago , and the area they lived in was what the teenager considered her 'safe place ' . 'It is the worst thing you could ever imagine happening , ' she said . 'Absolutely horrific . There 's no getting through the day - there 's no explaining it . ' I have to keep faith that she 's going to come back , ' she told KTLA . A LAPD spokesman said Kimberly was last seen wearing a red sweater , jeans and ugg boots when she left home to go for a walk and calm down at the nearby Mar Vista Recreation Centre . Despite knowing the area and walking there often , she has not been seen since . The spokesman said : 'Kimberly is currently taking medication and her family is extremely concerned . She is described as a 15-year-old Hispanic female with brown hair and brown eyes . She stands 4feet , 10inches tall and weights approximately 110pounds . ' Anyone with information about her whereabouts should contact the LAPD , Pacific Division Watch Commander at ( 310 ) 482-6371 . During non-business hours or on weekends , calls should be directed to 1-877-LAPD-24-7 ( 877-527-3247 ) . Those wishing to remain anonymous can also call Crime Stoppers at 1-800-222-TIPS ( 800-222-8477 ) .
Autistic teenager Kimberly Greenberg went missing more than a week ago . The 15-year-old left her LAPD home to go for a walk and never returned . Her mother Janice has now made a desperate plea for help finding her . She is said to be very trusting and has the mental capacity of an 8-year-old .