Hmm, this change looks painful. Or, it could be that her mind is being burned away along with her body. Her old clothes are reduced to ash, which tells me there will be no going back from this change. Considering the theme of a 'harem', that makes some sense.
Then again, fire isn't always a bad element. Maybe this could be a purifying of her mind, all outside things being burned away so the truth is all that remains? (Shrug)