Okay
So turns out I miss out on a quest chain from interacting to Mother Tree before going out and do things

Instead I went to hunt down and murder Shadow Prince
(I am a Human Custom with Sebille, Lohse and Fane)

Then afterwards I had Sebille Devour his soul AND consume his heart.

Upon returning to Temple of Tir-Cendilius
I interacted to Mother Tree

and Scion was upset that I ate Shadow Prince heart and etc.
and Now I have to decide.

a) Have Sebille remain who she is
b) Have Sebille meet her destiny and root herself to the M. Tree.


I mean Sebille will still be on my journey
but it seems it might impact the future alot.

So... What outcome should I pick thats best to have Sebille with me at all times and have a future where I wont have to confront her in a tragic ending...