Not much of a curse
Elizabeth Holly put a curse on the baron, the incantation on the parchment was supposed to bring the baron back to life so he could suffer some more.
Well, that didn't exactly work. All Holly did was to give the baron the opportunity to come back to life, and enjoy life again as a rich man, living in his very own castle, and torturing and killing his victims. Not much of a curse if you ask me! And I'm also sure Holly did not anticipate that the baron could magically disguise himself as a wheelchair bound elderly gentleman with none of the scars apparent.
Instead of giving the baron a curse, she actually did him a favor!