Working with Iggy at the heigh of her fame did nothing. Yes working with a big artist will get you noticed, but the material has to be right. Chances are she will probably get, as Mario said, one of his rejects. Unless she really is bringing her A-head game and got him to write something specifically for her or give her one of his top tracks.
I doubt it will get her a hit (but then, look at what we were saying in 2010, then along came On The Floor) but there is no question working with one of the hottest artists and producers of modern music will get her a lot of traction she'd never normally get now. This and the fact she's sleeping with the guy, they'll be a hell of a lot more focus on her song that normal.
Plus, if Drake pops up on the track as well (I wouldn't put this past her AT ALL).....she's gonna get a lot more interest through the lucky association......