Cheers for the info Gaz, unfortunately it's not me doing the work, I'm just trying to hep someone out. Really I should have just stopped when I confirmed it's not down to the printer driver, but once you start being helpful people just want more and more. I hate Macs, they truly are the spawn of satan, I feel so dirty having to have so much contact with them over the last two weeks.
Fortunately it's all academic now, I told her she best go speak to Adobe, for some reason she thinks reinstallin OS X and photoshop is going to solve her problems.