Ah, the Spirit.
Fun killer. At least personally. To play and to play against. But, there are arguments to be had about her being low risk high reward, when it should be the opposite. Also, Prayer Beads. Just... Just Prayer Beads.
Here are some simple changes for her that could be good:
When phase walking, survivor sounds are omnidirectional and have no collision with the Spirit.
Prayer Beads (Ultra rare, trading with Father's Glasses): Reduces your phasing sound to 5 meters, but Moderately reduces Haunting's travel speed.