in The World in Δ Hidden Forbidden Holy Ground (.hack) there was a statue of Aura wrapped in chains. in The World:R2 Hulle Granz Cathedral (.hack//G.U) has the same address (Δ Hidden Forbidden Holy Ground) and in it the statue is gone only leaving the chains behind.
in .hack//ROOTS Shino said that the statue was that of a Goddess who left the world which, according to Zefie, is more or less what her mother Aura did. but the statue wasn't Aura herself though as it didn't re-appear when she stopped her Twilight Knights from fighting during their battle against the members of Raven.
i recall reading that the backstory of The World:R2 one of the goddesses who is dead was supposed to represent Aura and CC Corp reclaiming their system from Harald Hoerwick and his work but i know that CC Corp Admins can't get rid of the Lost Grounds or even edit them.
So who was it that removed Aura's Statue in Δ Hidden Forbidden Holy Ground