How much of Flemeth is really Mythal?

The way I see it, the wisp!Mythal was never able to regain or rebuild itself into anything fully resembling her previous form. Anything that seemed like that was the case was primarily due to Flemeth, who is still in possession of her human aspect. But its not like the wisp did nothing to Flemeth when she took it into herself. It amplified her sense of betrayal, with her sense of revenge evolving to not only avenging herself but avenging the betrayal of the world and Mythal prime. ("Mythal was betrayed as I was betrayed! As the world was betrayed!")

I believe whatever knowledge the wisp had was severely limited, and Flemeth had to accumulate the majority of her power and knowledge on her own through through the ages by searching, collecting, and researching as opposed to simply gaining it through the wisp itself. I theorize the wisp was little better than a small pointer guide or, in some cases, a magical version of a working identification card. She is able to call Mythal prime's artifacts/name as "hers" after all.

So calling Flemeth just Mythal's "reincarnation" is a severe oversimplification. Flemeth, as we know her, is the sum. The collection of parts and experiences in her own life. Of which the parts that is Mythal are severely limited, but particularly impactful. In her words, "Mythal" is "no more separate than your heart in your chest". I believe Flemeth's human side was never 'erased', 'superseded', or 'dominated' by Mythal prime. Rather, the human Flemeth took in what was left of Mythal and incorporated her into her own being. Just as one incorporates memories and experiences of the present and past to help form their future self.

I believe Flemeth at her core is a mortal (artificially immortal) being who, primarily through her own actions and will, discovered the secrets of the past and seeks to have them avenged.