Im a fan. MKDA was her first version and as you know, characters change with each new game (some more than others). There is plenty of potential to update her story of moves to really make her seperate from SZ. I can see the similarities between the two but i dont see her as a SZ rip off.
What about her ground freeze that makes opponents unable to balance themselves or just stick to the ground, or the ability to send out a flurry of ice shards.
I really like the idea of frosty breathe - similar to scorpians fire breathe but is freezes opponents.
Well one thing you mentioned, her ground freeze, and how you described it are exactly the how Sub Zero's freeze are or have at once been like. In MK2 they slide toward you all unbalanced like, and in MK9 they stick to the ground.
I think her character is going to be doomed to being called a rip off or unoriginal no matter what they do, just based on the fact that she has freezing powers and so does Subby. But then again, Street Fighter has a ton of Ryu clones, so I guess it could work.