(A/N: This is a companion piece to Asymmetrical. You don't have to read that first, but this make a lot more sense if you do. This basically explains Rosalie's thinking behind asking Leah for help with her plan. And it's called 'Why' because it explains why Rosalie asked Leah for help. And thank you to The-Critic1337 for this idea. Enough of me rambling. Enjoy!)
Why
Her niece was not going to be with that dog.
Imprinted or not, Jacob was not a good match for Renesmee.
Of course Bella would want them together; she just wanted Jacob out of her conscience.
But Jacob was a mutt. Renesmee was half vampire. They wouldn't be compatible, no matter what imprinting said.
Rosalie did not want that dog around her niece. And the only way to get him away would be if he fell for someone else…someone like Leah.
Rosalie saw how Leah looked at Jacob, and she saw how they would be a much better couple than Jacob and Renesmee.
Rosalie had her plan all set, except for one thing.
She would have to ask Leah for help.
(A/N: Let me know if you see any typos, and reviews are love!)