After she failed to track down her sister, the ponytailed girl simply returned to the mansion and continued to torment her family until she got bored with it.
She used her control over the spirits to force them to do whatever she wanted, but as always, due to her hatred towards them having been erased, she started to lose the joy of extending their torment.
She wondered if any emotion would be felt if she simply asked them to start killing each other, but even her father's death caused no reaction at all, so she simply gave up that idea.
The girl decided to just leave the house altogether and try to embark on her quest as a weapon of the gods.
Mia then continued to live the rest of her life as a champion of the north after the day. Traveling the world, searching for demons to slay, fulfilling her duty of trying to make her benefactor the next supreme deity.
The first demon Mia encountered opposed no challenge to her.