Logic says so... But the trolls made it clear that it was something that I could do even accidentally as my powers keep getting stronger. If I could hurt my sister even at such a young age, I don't want to think what I could do now if I lost control again.

[It's a trauma ingrained far too deeply in her. Even now, away from her world and Anna, she can still see it clearly when she closes her eyes. She almost killed her sister as a child and her powers are now nothing but stronger, how can she not think that she could kill someone right away?]