Who has delete the Chii's memory?

Chitose Hibiya, the lanlady. Ms. Hibiya didn't know that Elda had downloaded Freya's heart into her. After the incident with Freya occured people thought the same would happen with Elda and plotted to get rid of her themselves. Knowing this, Chitose Hibiya deleted Elda's memories and put her in the trashcan. But Freya still was inside Chi becuase she had downloaded Freya's heart into hers and even though Hibiya deleted her memories,She couldn't delete her heart. P.S it actually was her heart that Elda downloaded and if you listened while Hibiya explained all of it to Hideki,while freya was laying there Elda said ''I will download your heart into mine that way you will still be alive.''