Honestly no, it's far too vague and shapeless to be considered snow, I don't think the colour choices on that thumb indicate that either - but I think she would absolutely look amazing in a snowy scene and it would really make that fire pop. Plus, on snow, reflective light often shows as blue (because of the sky being reflected) so you'd have those beautiful contrasts of cool blue with the warm orange (and a complimentary colour palette)
Given your concept the 9th could greatly work, but with a twist to it... You could make her block an atack and preparing a counter at the same time.
In that way it'll show the (harden tranformation)
Anyway she's a straitforward type of champion, you have many ways to show her power. ^^
I'm short on time to though, keep it up!