I've seen this behavior in our population. I don't know what is going on with her and I no longer see ghosts after I did many meditation retreats through a Buddhist Burmese meditation master. Most children grow out of their invisible friends and seeing ghost as well. I was told the only way one can know what is going on in another persons mind is to be a Buddha or God if you believe in Gods. I do not believe modern psychology or science understands human experience very well, especially our Westernized Modern psychology.