In book 3 she was minorly bad, but in a sympathetic "human" sort of way. She was trying to protect her family, just like Cutter was trying to protect his. Her concerns and ambitions made a sort of sense. In books 5-6, she was nuts. Tipped over and competely unaware of just how messed up she was being. In book 8 she was back to being bad, but in an understandably "hot rage" sort of way.
From there on out...she was "just drawn that way". Turned into Default Villainess, because they needed SOMETHING to use as the Big Bad in the storylines. I really didn't appreciate that at all, nor do I appreciate her current condition as "angry possessing demon/spirit".
I want pre-tortured-soul Rayek back. And I want a winnowill storyline where she isn't the one-dimensional bad girl who likes to create mutant animals and harass every other elf she meets.