Comments of chapter undefined of Quick Transmigration: Goddess Of My Imagination

I don't understand now why Ely even release Ai from boundless realm? Just to formally fullfill her promise for Alisha's spirit? Or just because she virtually spent 3 years with her? Ely could easily tell her complete story of Aisha and even let her look to Alisha's memories but decided just hide it from her? Is it really how friends should manage sensitive topics? If Alisha know about her past but decided to left it behind and start over as Ai this is a different story. But keep things "as is" for personal benefit looks like Elysia don't trust her friend at all. Why she extract her from boundless realm then?