Which of these names would be best for this character?

I think that Celeste fits her best. I think that Celeste would fit her better, since I always imagine someone named Celeste to have dark brown hair and pale blue eyes, and I've always thought of someone named that wouldn't exactly be "nice". =] Celeste is also a very lovely name, too, and I think it fits her very well. Good luck with your story! =]