She reincarnated she was supposed to have all her memories, but for the mistake of a goddess everything goes wrong, and the world ended.
So all the gods made a council and decided to regress the time and reincarnate her once again after the forgetful goddess mistake.
“Because the one supposed to balance the world, receive a lobotomy and get as bland and plain as water! NO worst as distilled water!”
“I am sorry!” The goddess cried again.