She also had the terrible face/heel confusion, at times. And that twin magic shit- for that to actually work they would need to actually be identical again.
The whole face/heel confusion is not all Nikki's fault, it's a mistake by the incompetent backstage suits.
If The Bellas are heel, let them play the heel roles against other divas factions.
Last night is a good example, Nikki is a heel and at one point she started working as a face.
Actually, Sasha started that match as a face, IIRC, so then she starts bad-mouthing Nikki and the crowd gets confused, so they turn on both of 'em and started chanting for Lesnar.