I can't put my finger on it, I used to do fantastic against her but more recently I've noticed that Spirit slaps. I think this is the problem:

Wraith has a small frame to let survivors escape while uncloaking

Nurse's blinks can be dodged

Billy can be dodged

Oni...well...it's difficult to but he can be escaped

But not Spirit, there's 0 time frame for survivors to deal with it and phasing is non-directional so she gets to move real fast, has no time frame, and essentially has Undetectable.

Myers gets undetectable sure but he has a slower movement speed and he can be seen. The Nurse can get in real close like the spirit but you can see her gearing up to go. With the Spirit though you can tell she's phasing, then poof she's gone, the only defense against her is to not run and not be injured and in a chase what can you do? She can see your trails, can anticipate where you're going and if you try to turn away and juke her, you're still screwed. Her add-ons let her beat you to any location you go and if there aren't many jungle gyms like Blood Lodge for example, then running her is an impossible task, especially if she has high level movement speed add-ons.

Somehow she's come this far without being changed once, it's frankly ridiculous and I'm sick of it.