A day once dawned, and it was beautiful. A day once dawned from the ground, then the night she fell and the air was beautiful. The night she fell all around. So look, see the days, the endless coloured ways, and go play the game that you learnt from the morning ~ Nick Drake
Crucifixes? better get the salt out as well, they make absolutely no difference at all unless your ultra religious (more complex than that but simply put forget them), and the priest probably not much use either, sounds like a single mischievous spirit or poltergeist, however i would also like to point out the date, 3 days before april the first, though that may just be bad luck. Would be curious to know more details and especially the history of the family and house and the girl.
If ever you think your being watched, or there's something under the bed, don't just look once to check, look again carefully, just because you cant see them, doesn't mean there not there. in the vastness of existence and reality everything is possible, every fear is there, if its not under your bed now it will be soon. sleep tight.