I actually used the Wreath of whatever on Celina, but the dialogue didn't reflect Geralt saving her. Yet, in the epilogue, she apprears normally for me. Did i do something wrong? Am i missing something? Or this is how it is done?

I've been hosting a fix on Mediafire for years now: Celina Wreath Fix. I don't even remember the mod author and AFAIK this is the only place to download this fix. I'm thinking about uploading it to NexusMods to get it some more visibility.

Basically it adds some dialogue in the appropriate places so that you can use the Wreath, free Celina, and have Julian and everyone acknowledge this outcome.