She's a ghost, not a demon. If you mean "help" as in exorcise, feel free. You won't like the results.
...my initial thought was a land mine in the shape of a baby. A baby-shaped mine, set to explode. And, when you think about it, that'd be a very effective weapon. Exploding babies, exploding everywhere across the battlefield.
I am a messed up adult.
I just always want to see if characters can do "the wrong" I have no one who would help the ghost, no big issues with me crashing anything >.<