WHO IS SAE? (Sousei no Onmyouji)

WHO IS SAE?

Hey Bloggers and anime lovers, here is my anime question today from the anime "Twin Star Exorcists" (Sousei no Onmyouji): Who is Sae-chan?

  Now we know that Sae-chan was found by Rokuro and the other exorcist in Magano....on a panda? (Don't know what a panda is doing in Magano but that's for another time >.>). Sae never really explained anything about herself, so she is a total mystery to the exorcists but Rokuro and Benio take her in as their 'daughter'. However with the recent episode 28, we might have some new info on Sae. *SPOILER ALERT*

In the latest episode posted today, we see some sort of tree which seems to contain large amounts of spiritual power. Later in the episode, Sae-chan tries to protect Benio  and releases a power similar to that coming from tree, so the to a definitely related. 

 

My Theory: Sae-chan was created by the tree.

It explains why Sae-chan doesn't call Benio "Mama" because the tree is like her mom/creator. It also explains why Sae-chan has a connection to Kyoto because that's where the tree is, so its technically her home.

  As to why Sae-chan was created, why was she in Magano, is she related to Kuranashi, I don't know?