It won't work because Wigga British girls trying that stuff in America is laughable to them. It's why N-Dubz went nowhere despite Tulisa's attempts at networking. It's why Lady Dynamite went nowhere. It's why Lady Sovereign went nowhere.
Jesse J got airplay because B.O.B. was on the track Price Tag. That's it. Because he is a star and she is not and his fans want to collect his discography.
Seriously, anyone trying to use Jamaican patois or gangsta rap slang when they come from a priviledged middle class upbringing... when they have real artists that have suffered real hard times out there... it's insulting to them. Why accept a crap Brit import trying to play gangsta chick when they have the authentic artists on their doorstep? Over here we're mostly white middle and working class so we don't mind one of our own doing a transatlantic impersonation, it's made for our lamer sensibilities and is less threatening to the general public's perceptions as a result.
Cher Lloyd is not Miley Cyrus and she ain't Lil Mama. She ain't got the industry backing of a Willow Smith. She'd go nowhere except ending up as a punch line for Pitchfork Media as slang for "crap British wannabe rappers" like Lady Sov is now.