[Turtleen]

Though I haven't read it in the game mode, I've read all the dialogue, so I can't say that I'm understanding everything correctly but I have a bit of a theory.

Spoiler for theory:

Beatrice not existing was mentioned before. I think that in a sense she doesn't exist, but she does.
Many people who claim to have seen Beatrice are making it up and using it to cover up their lies. Others may realise this, but they have used Beatrice as a cover up too so they would be unable to accuse the other of lying in fear of their lies being exposed.
Maria's version of Beatrice is the real Beatrice. Maria seems to be a bit like Rika, someone who's connected to the supernatural aspect. Their are times when she does seem to almost become a different person. It seems like this is her connection to the supernatural? Or when she is experiencing it?
Like in Higurashi, Oyashiro-sama's curse and Hanyuu, Beatrice and her riddle etc. could be not nearly as menacing as they seem.
I always thought that the two people in the village were Lamda Delta and Bernkastel, possibly meaning that to get to Beatrice/gold somone must find Lambda Delta and Bernkastel as well? I don't know that part is just what I had thought the meaning was at first xD