Anyone that have read 'Fifty Shades of Grey' will know Rita Ora's character Mia received very little mention, especially in the first book. So it should not be of any wonder that her onscreen time is reportedly only 90 seconds (that's a baffling 1 minute and a half!) However, I don't think this is the issue at hand here.
It seems she heavily attached herself to it because she obviously felt it would give her a lot of publicity. Though, that is quite interesting she would wait two days before the film is released to announce it as a "blink and you’ll miss it" role. Unless a lot of her scenes were cut out at the last minute and she didn't know about it. Hmmm...
@FiftyShades London premiere tomorrow! It’s a blink and you’ll miss it role,but I’m so happy to be part of it!Thoughts?
— Rita Ora (@RitaOra) February 11, 2015