Mmmm...What I would do to 'nerf' the character would be, first of all, drop the 'Blink' ability. That is a short-range teleportation spell whichever way you look at it, and I'm sure you didn't have a 'mage' in mind when creating the character. Secondly, her healing factor. How strong is it exactly? Give an example, like how well does it mend wounds? How long would it take to close severe injuries? that kind of stuff. Needless to say if it is 'Wolverine-level' healing then that is off the table right from the strat.
Faster and stronger than your average human? Sure, sure. Better reflexes, better sense of smell, good tracking skills. Sounds about alright so long as you dont OVERPLAY them. The part about her skin being cold yet radiating heat and stuff, I belive what you meant by it is that...her body temperature is naturally on the lower side (making sense if one is to assume she is some kind of Northern fantasy-race), something purely 'cosmetic' which won't really matter in combat situations.
As for her other 2 techniques? Well... they are not BAD or particularly OP, in my oppinion but, again, they feel more like something a 'mage' would use. Couldn't you just see a wizard pulling an ethereal sword out of thin air and swing it around? Maybe change them into something more closely resembling of a 'special move' kind of stuff? I dunno.
But hey, those are just my few cents '''^^