Gwen has magic.
When Morgana stuck her in the Dark Tower, she could hear the mandrake roots screaming, something only magic users can do. This could be a plot hole (because that's never happened before), or we can have some fun with it. I know she seems wary of magic, but even Merlin worried that his made him a monster. If Gwen never had anyone to assure her otherwise and if all she ever saw was magic gone wrong, she could have easily grown to believe the lies.
I don't think she would had had much, or that she used it intentionally. You will note, however, that when Gaius tells her Merlin has magic, she doesn't seem surprised or horrified or anything. What if she'd noticed Merlin doing little things for years and assumed he was like her?
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Merlin Headcanons
Fanfiction. . . As well as theories, drabbles, and rants on ships.
