As I understand it, the issue is trafficking: Trafficking involves, force or coercion (?). So whenever I looked at an article on this case I wondered how she arrived in the UK, e.g. whether traveling alone on a commercial flight. They never seem to say. And if trafficking, by who? The dead guy? The most obvious scenario may be that someone offered her a plane ticket, her some money to spend in London and a phone #, take it or leave it. Wealthy people generally have lawyers.