She's on another record with wale called blow on the album. I doubt she's tripping, did anyone know tiara Thomas before bad? And if so, to what scale/degree?
She may wrote the song but for an original featured vocal to be replaced completely on a remix is unheard of. It's embarrassing.
It's like saying "Lolz @ your flop useless ass, let's get someone who's actually capable of turning this to a hit, and who's better than than the #1 bitch in the game right now Rih? "
I wonder if rihanna is gonna rap for a whole verse? 
but it ain't that bad tho ... I guess..