Im an idiot lol. I thought Sophia was this girl. I wanted to know how to meet this character. I knew the patreon post said this was the last person you'd meet in Chap. 2.
It is related to the main story which is still in production, becauise she is kinda related with chapter 3. We were trying to release chapter 2 as soon as possible, therefore she appears only for a certain moment in current version, but I don't want to spoil it. If we provide more stories to her, we will release probably an update to the public version introducing her more.