Not a lot of pleasantly content spirits just wandering around the mortal world, from my experience. Most of them have moved on into... whatever's past their life, I guess. It's only the upset ones that stay around for any length of time. Angrier ones stay longer.

[... Geralt are you trying to teach Pearl how to be a ghost hunter]

That I don't doubt. I intend on tracking her down to see if I can help her. Plan on speaking to her grieving lover, too. Er, wife?