You need to help her around the dungeon until she gives, you a graceful curtesy when you meet her. Then beat Sophia's boss fight not sure how many of her fights are needed to continue guessing at least 2.
https://youtu.be/w9Ti6y4rt9Q?si=TjZ-wWnhkAuAiu8M
Just keep helping her then fight Sophia use restraints, stuns and demon layer to make your life easier
hope this can be of some use :]