Change Elsa

The first thing that came to mind, of course, was her huge crush on her sister and the queen of Arendelle. She knew she loved her, depraved as that love may be, she'd known for a long time. If only she could get Elsa to love her back...

But now, with these powers, making Elsa fall for her would be as easy as snapping her fingers. And with that out of the way, she could focus on other things that she wanted to change.

She had so many ideas! She could transform Elsa as subtly or as wildly as she wanted. Her personality, her appearance, her powers, her mind, it was all Anna's plaything. Even better, she could make it so Elsa never remembered it being any different in the first place.

So many options, now the only real choice was what to do first. Oh, this would be fun.