Right now, we have no way to ascertain how exactly she functions.

All I could see through my mirror were things after she came to life as a tsukumogami.

The return of her biological functions wasn't because she became a human again, but part of her transformation into a youkai.

In the same vein, the reason she still has her youkai powers is because she is one.

Then... What are you going to do about her...?

Long story short, it would be possible for me to dispel the hermit's spell and send her to the afterlife. ...But...

...But?