MLP Scientifically Accurate Frozen

(Sorry Anna's head a little big. Just ignore it  )
I think Frozen was a great movie, I have no problem with it, but when people make them both alicorns, (especially Elsa) there's a problem.  
~~~
Elsa:
Now, the queen of Arendelle must have to be an alicorn, right? Wrong. Just because she's a queen/princess/royalty, it doesn't mean she has to be an alicorn. Here I made her a unicorn because her ice powers don't just come out of nowhere. Her wings do no use, as she proves she can handle a lot of things without them.

Anna:
I think she would be a pegasus because she doesn't have magic. She's more of the playful type, the adventurous type. And whats a unicorn sister to do without her pegasus sister counterpart. I didn't make her an earth pony because that would be kinda boring? Their parents were probably not earth ponies.

~~~
All in all, I rate the movie       
I rate the alicorn Elsa