Because of price, vsd3s would be pretty sweet, especially if you could get it in red.I don't think wear style is that important, and as long as the isolation is a average (enough to let you focus on the music) it should be good.
Soundmagic e30 is really nice for the price.
Sony mdr-ex58v is only 15 bucks on eBay and comes in many different colorsand sounds aamazeballs.
Pistons are very good for their price if she has a android phone that might be the right play. It's v signature though