So, there is a girl. The film opens, I believe, on her chasing someone through a church, though this may the ending, I saw this film easily over 10 years ago. She moves towns with her father and moves into a house where fake ghosts are projected on walls and glass to scare people away.
One scene of the film involves her sitting in what I vaguely remember as an attic, surrounded by pictures and notes, solving this crime, or attempting to solve it.
I hope this is useful enough.