Hopefully she doesn't turn evil. Just because the one on E2 was bad doesn't mean she has to be.
I hope she doesn't. In addition to being lovely, intelligent and very feminine, she's also one of the sweetest, gentlest, most caring characters I've ever seen portrayed. And I've heard almost NO profanity from her. It's like they decided to write her by what I like in a woman. So, I do NOT want her to be a villain! I'd rather she be the hero Ice, instead of the villain Killer Frost. (Precedent: on
Arrow, Isabel Rochev became Ravager, instead of The Queen. And Roy skipped completely over being Speedy, on his way to becoming Arsenal.)
Plus, if Caitlin's a hero, that'd set things up for a "snowball fight" between her and another Earth's Killer Frost!