So I went to Windhelm and explored a bit, came across Sadri's used wares and solved this ring thing he had. Viola Giordano was wandering around and complaining about the killings, so pretty much alive and kicking. But when I started investigating the Blood on the Ice case she wasn't around anymore. Jorleif keeps telling me to get an earful from Viola, but she is nowhere to be found... The first (few) nights the quest marker hung around Candleheart Hall, but she wasn't there. Waited for days, checked out her house at different times during the day, nothing. Sold the amulet to the guy from the museum, went looking for her again, nothing...
I'm guessing she is dead, but I never killed her or saw her getting killed... This is really sad, especially considering I went on with other quests and have A LOT of time spent after this bug making it impossible to get a previous save loaded... Is there some magical way to get Viola to come back or get around her or is the quest doomed for the rest of my (Skyrim) life? Who else has this Viola gone missing problem?