I would take one of the shocks off and go to your LHS to see if they have any springs that will fit that are stiffer. It might not be specifically for that vehicle, but that doesn't matter as long as the fit is right.
the UE springs fit on her as well. They cost 20 bucks or so per 8. the red ones are about as stiff as the blue ones, while the blue and black ones are pretty stiff.