I really like this

This is adorable.
But! I have one little constructive criticism, if you want it. I feel like Anna shouldn't immediately conclude from the snow and ice that Elsa has powers. I mean, if I were in Anna's place, I'd be more like "Where the heck did this snow storm come from?" I'd be really confused and wouldn't connect it to Elsa that quickly. I just felt like that part was a wee bit unrealistic.
And the only reason I gave that criticism was because the rest of the writing was excellent and I feel like all of the story should be excellent. I like your writing style. Looking forward to your future works.