Serious twilight question!! best answer!!?

I'm afraid to say that Jacob, as a werewolf, CAN'T un-imprint on her. There's your main problem. He just...can't. If werewolves could, then they probably would. Don't forget that one werewolf imprinted on a three year old. So, you will have to think of something else. Maybe Renesmee falls in love with someone else when Jacob is gone. Jacob leaves town for some reason for a month or so. When he comes back, he finds Renesmee fell in love with someone else.