Also, as someone mentioned already (although I can't remember who or in which thread, sorry) - it might have been a similar case to Robert Joy. He was turning down other jobs to do CSI:NY, and he eventually had to ask them to make him a series reg or let him go (obviously, they kept him on). It's possible that Emmanuelle's part on the show had gotten to the point that they needed to either make her a reg or get rid of her - and if they couldn't afford to bring on another reg, they really had no choice. (Considering that someone - was it Lenkov? - said once that it was a possibility that she'd get added as a reg eventually, I think this might be a real possibility.) Maybe they could cut back on some of the expensive special effects (in the lab and such) - they're a trademark of the franchise, but some of them aren't exactly necessary. Virtual autopsy, anyone? Or they could stop using stunt casting.