[quote=@Nymeria]
Well let's see....There are witches who are very secretive and generally stay hidden. They are known to curse people and have created many of the monsters that are running rampant.

If you want to have a character who is suspected of something, they could be uncommonly skilled with alchemy, as that is mostly related to witches, also. While it isn't the same as magic, it can create potions and poisons similar to magic. Using alchemy, you could make things like smoke bombs, poisons that cause various effects, like paralysis or hair loss, and other things people might think are magic.
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The basic idea was that this person is either a pagan "druid" or a daughter of some kind of woodsman with a missing mother, and lots of stranger circumstances surrounding her missing mother.