To be honest, Jessie J is coming out of this looking really bad. Yes, MIsha B has showed her up on her own song, but she should at least have the class to give a bit of acknowledgement to how much MIsha B has helped sell this song to the public. The only comments she made on Misha were some half hearted comments on X-Tra Factor after she performed about MIsha singing in a higher key.
And Jessie has no excuse for not acknowledging MIsha's contribution to her song's success. Jessie is on twitter all day long, begging all her fans to buy the song, keeping them updated every time it moves on i-tunes....and you are telling me she doesn't have the time to give MIsha B a twitter shout-out for doing her song justice yet again?

. She's deliberately ignoring the MIsha B effect, because she's embarrassed.
She comes across as being bitter/envious of Misha's greater talent. Tulisa came off similarly when she torpedoed MIsha's chance of winning X-Factor with the bully claim. Tulisa is going to be competing in the same "market" as Misha when she goes solo (same for Jessie J). Jessie is a lot more talented than Tulisa, but neither want to be made to look average by Misha, so I suspect both are hoping she flops when she releases material.