User blog comment:FairyRaven/Fairy Tail Chapter 456: Orders, Review and Commentary/@comment-1776824-20151010095429/@comment-24102956-20151010100438

I doubt even the real Seilah wouldn't appreciate being taken over by a human and may try to break free. I wouldn't be surprised if Seilah was influenced by Mira's goodness aura inside her body for just one year timeskip lol.