Some hours ago, it seemed to be a misunderstanding on twitter, saying that Estelle said that Rihanna didn’t “smash” Run This Town and that Estelle would have done it better herself, but she never said that. Take a look at this:

JoannaSimkinAttention all!!! ESTELLE NEVER said she would be better than Rihanna on the Run This Town song.That was me and @javachik! RT it!
about 13 hours ago from web

And then Estelle said:

“twitter’s a funny old thing..I’ve never ever said anything about me wanting to be on the rhianna /jay z/ kanye track” someone else……
about 9 hours ago from web

Go to EstelleDarlings to go to hers official twitter.