They can be. They weren't much of a thing for us until a few years ago. When you're facing down something on a fairly regular basis, you get good at knowing how to deal with them.

If she DOES turn out to be a demon of some sort, I'll have to show people how to make a Solomon's Seal. Again, not guaranteed, but it might be able to keep her in one place while we sort out if she can be exorcized.