Little Girl Talks and The Dark Shadow

The other night in our bedroom, while we were in bed , I was watching TV and Karen was pretty much sleeping, over my left shoulder, towards Karen, I seen a tall dark shadow. I seen this twice and thought that it may have been someone in the door way, but it wasn't. I looked and no one was there. Not long after seeing this the second time, Karen got up, said she couldn't breathe and it felt as if someone/thing was choking her. This lasted for about 5 minutes or so and then we went to sleep. I just found out, earlier tonight that our youngest daughter talks and interacts with what presents itself as children ghosts and she does this in the day and at night in their bedroom, sometimes in the closet with the door closed. The one in the closet she talks with is a boy,that's how it presents itself anyway and she says he wears a mask and it around her height 3'-4'. In our bedroom one night she was telling someone or something to stop it and she was very ecstatic about it. We asked her about it that night and she said nothing, but I asked her a little bit ago about it and she said it was a man and he said something to her, but she couldn't understand him and he pounded on the attic door, from the bedroom side. So in conclusion, this is getting worse and I have come to find that it happens quite often, but without telling me, wonder why?