Responses
That sounds very logical, it wouldn't surprise me at all if you were right.
But I really hate that saintess, hurting and deceiving others just to live comfortable or to have more power is truly the worst （￣へ￣）
Here's a thought: I think Isabelle retained her memories like Kaoru and was given the same warning not to practice magic until 3yrs old but she didn't listen. Hence the consequences she develop an illness. Because her skills had something to do with "transferring/switching" she took advantage and used it on Lila. Also because she figured that it's free sailing being a saint, as someone said earlier she used the ring to distort the truth about Kaoru's title.