It's not that simple, if you take the context clues, including her encounter in the kitchen at night, you learn that it's not that she's afraid of something hurting her, she's afraid of hurting someone, she's afraid of herself
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Ayyy.
Someone else put the pieces together…
Tho I wonder if we’re right…
But yeah. Pixie said she got attacked by Morgana’s creatures, but then they found no bodies, only craters after she ran away.
Now, Emma genuinely seems like the type of character that wouldn’t hurt a fly. If you told me she’d gone vegan because she didn’t want to hurt animals, I’d believe you.
So yeah, the shock of killing a “living” being.
Plus her realising how dangerous her rock elemental powers can be.
Adding to that, she’s terrified of Morgana and now she just went and killed some of Morgy’s minions.
I won’t deny that she’s afraid of Morgana or the ORG, coming after her. But I sincerely believe that she’s more afraid of accidentally hurting the people she cares about.