It didn't sound like it was an item I got but rather an event that happened. Also, the same night I got a description about that there is a killing role so it might possibly be this. It also wouldn't make much sense that creepy girl gave out such an item this far in the game. It's hard for me because I don't know much about those roles at all.
By the way you described it at first, how you "found a doll in your bed," it most certainly sounds like an item being given to you (which I guess could be said to be an event, to-mae-to to-mah-to I guess). But I definitely agree with Sam that I feel like this is highly likely to be a creepy girl role and not marking you for death (unless you die tomorrow, then I guess that the delayed theory is proven I guess. Hopefully that doesn’t happen)
I think that because a creepy girl giving out items this "far" into the game isn't that unheard of though. Take for instance during the Pirates vs Cowboys game hosted by Priz where I acted as the Innkeeper and simultaneously a "creepy girl." I had to get
3 "dolls" (I think they were called books for flavour), to be carried by people, and then get them killed off.
If I remember right, creepy girls normally only need 1 doll to be held by a dead player in order for them to win, however as we don’t know the nature of these third-party roles, and the fact that some roles have certain caveats that weaken them a tad, like the Honorable Vig dying if they kill a townie, then there is the
possibility that a creepy girl may have the requirement to get more than 1 “doll” killed. If that is the case then perhaps someone who I already dead held another doll and died with it without telling us. Unlikely because that seems pretty important to tell the town but it’s not unheard of to keeping it a secret.
Of course that’s only assuming it is a creepy girl-esq role, which I feel is most likely in this situation. (which means, unless the Mafia or third-party killer want the creepy girl to win, you’re basically unkillable if the claim about you being the conspiracy theorist is true of course)
There’s still other chances however that it could be another role though, but my bets are on a creepy girl. At least this information gives us a new lead and insight into the third-parties.