Ah got it, it was in the quest tab. Thanks!That's strange.
Are you sure the quest is not already activated (check in the activated quests log) ? AFAIK, this is the only reason to not get this quest.
For being sure, I've just started a new game, gone into the tavern, chatted with Carla and immediately she is talking of the "disappearance" of Fina (which starts the concerned quest):
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