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At the end, I left the Venerable. I didn't wanted to train my soul this night anyways and wanted to go somewhere else where only I can go. I left Belle in the outside world, she transformed into a little fox and hopped over the bed, sleeping comfortable through the shared warmth. She was a strong-willed girl and every day I feel more motivated to just adopt her as my third daughter, but she's way too old for that to be honest. Her desire for motherliness from her creator seems to be a subject separated from being treated as a child or something. I don't really want to judge the venerable anymore, I already told her everything I thought about her ways of doing things, and I simply decided to move on with my plans.
Check "The Protagnist's Sister Is Actually the Strongest"!