"I Ain't Afraid of No Ghost" procs after sleeping at a camp (I don't know if it works if done at the tavern) if Arona was taken to a ghost-related dungeon, such as Fort Marrok, the Palace of Ice Catacombs (if she's in the party when triggered) and the Spectral Smith as part of getting Brint his Winter Knight set (possibly unavailable seeing you finished the Mad Cow quest).
Now, I remember having read that saves that existed before the patch which introduced the quest are automatically assumed to have done something ghost-related with her.
It seems that you have some missing quests there, such as "For Want of a Nail" (Nakano asking the Champion to fetch some metal), "Artifice Testing" (Rindo asking the Champion to test Nakano's puppets), "Educational Help" (Kiyoko asking the Champion to fetch a weapon to train kid Kinu), "Father Where Art Thou?" (Solveig asking the Champion to fetch some evidences concerning her father) and "The Wyld Hunt" (the Champion meeting Elyon to learn about the death of the former Winter City's king).