Lots of kids go through afraid times,  for no good reason, mine lasted until the day I got married and then my new husband had to sleep with a light on because I was deathly afraid of the dark. Its so horrible for the person going through this, I had a parent who thought only of herself and never cared to get to the bottom of my problem, naturally I learned as an adult after seeing a few psychiatrists who blatantly told me how dysfunctional my family was. I would take a look at myself and not her and try to figure out what's really going on, don't lose your mind but help save hers.  If you can't figure it out, they do have pediatric psychiatrists who specialize in children who are frightened.   They have someone at Massachusetts General Hospital in Boston, call them and maybe they can recommend someone wherever you are living if necessary.