Officers and her family are growing increasingly concerned for the welfare of the 16-year-old, who has now been missing for 11 days.
She was last seen at her home in Whitelot Way, Southwick, at about 10.30pm on Monday, September 26 and it is believed she is in the Brighton area.
Inspector Roy Hodder said: “We are extremely worried about Bonnie Rose because she is only 16 and she is vulnerable. We believe she maybe within the street community in Brighton.
“Her family are desperate to hear from her, and I would urge anyone who has seen her or has any information about her to let us know.”
In a direct appeal to Bonnie, Insp Hodder added: “Bonnie, I want to stress that you are in no trouble with the police whatsoever.
“We are keen to hear from you so we can help and support you, however we understand that you may not wish to speak to us.
“If this is the case, you can call, text or email the independent missing persons charity free of charge on 116 000 to let us know you are safe and well.”
Bonnie is described as white, about 5’ 10”, of medium build, with shoulder length blonde hair.
She wears glasses and speaks with a Welsh accent.
If you have any information about her whereabouts, email [email protected] or call 101, quoting serial 1555 of 26/09.
If you suspect she is in danger or in need or urgent medical attention, dial 999.
To view the video, which will go live at about 2.30pm, visit www.facebook.com/sussexpoliceforce
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