I don’t think Erin-chan would use pirate on 1st day, with this role you wait at least 2-3 days to know people’s roles a bit before choosing.
She may have been killed because mafia misinterpreted her hints or for making recaps.
There is just a problem with this line of thought, there was more than 1 person in a 2 vote-tie, and any of them could havedied because it’s a cointoss deciding who dies in those cases, mafia probably would not care or just jump in someone that already had a vote, but since 1st day is so random, it is possible they also just went along and voted whoever had a vote, because there was nothing much to go. Tho If Shad said he was vanilla, I would expect mafias to save his kill for the night to see if he could be recruited, the same goes for other vanillas (if there are more).