I personally think that instead of a cover, she should do a track with someone else. I think that a duet type song would really be great. And i don't mean a track with Stephan Jenkins. That would be too easy. Or Linda Perry, because a lot of people would be like, "Who?"
I'm thinking she goes for a Kayne West type song. You know sort of like the ones he's done with John Mayer and Adam Lavigne. A song like that would really sell the albums, and it would really be stellar.
She could even do one with someone else, Madonna? Really anyone cool, just not a pop princess, that would just send the wrong image.