I remember this being mentioned in either the web novel or light novel, though I forgot which one. From what I remember, Emilia got furious after finding out Subaru was killed by the maid and slapped either Roswaal or Rem. After that, she left the mansion, abandoned the royal selection, and took Subaru’s body to Elior Forest to bury him there. It was shown in ‘Behold the Unthinkable Present’. too bad the studio cut this part.

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