TBH:
She needs to perform a lot of acoustic songs, such as TOTGA, Uncle, BTGOG even maybe. I think it would be perfect for her to do something that would be good for her voice. Such as:
Setlist:
1. E.T. (Live, because she can sing this song fairly well)
2. Uncle/Thinking of You/BTGOG (Live, because she slays her acoustic performances)
3. The One That Got Away/Double Rainbow (Live)
4. New Single Bad Photographs (

) (some pre-recorded vocals)
5. California Gurls/Teenage Dream (some pre-recorded vocals)
6. Firework (ALL pre-recorded vocals)
And she would get some critical acclaim for the acoustic part, because she would sound good. Also they should THOROUGHLY rehearse this so the pre-recorded vocals are as little obvious as possible. For Firework she needs to make a huge spectacle, even bigger than it is at the PWT, tbh. This being said, if she performs Bad Photographs I think she has a chance of #1 debut, or at least Top 3. Because I mean, if it is a new release and POM could do it with just a Grammys performance, Bad Photographs should be able to do it, if it is good enough and considering the audience will be much bigger than the Grammys.