- Ella is described as white, 5ft 7ins tall
- She was wearing blue jeans, a green coat and a jumper with Ugg boots
- Anyone with information should contact police immediately on 020 8345 2710
More top news
A police officer who spent six days crawling the London Marathon in a gorilla costume has finally completed the 26-mile route.
A man has been arrested on suspicion of murdering a 48-year-old man who was stabbed to death on a bus in central London.
Transport for London has made the badges and accompanying cards permanently available after a successful trial in autumn last year.