Sussex Police has asked the public for help to find the 19-year-old.
"Can you help us find Gabriella, who is missing from Warnham?” a social media post read.
"Gabriella, 19, is 5ft 7in tall, with pink and ginger dyed hair and may be wearing a grey hoodie and a black bodywarmer.
“She was last seen in Warnham, but also has links to the Horsham area.
“If you can help, please dial 999 immediately quoting serial 589 of 18/08.”
1. Teenager reported missing
Gabriella, 19, is missing from Warnham Photo: Sussex Police