As DM, I would love it if a player came to me with this as their origin. I’d have so much I could work with in terms of their backstory. Rag to riches to rags to riches story arch. Saving their mindflayer patron from the other mindflayers who rejected it for their kindness. Maybe having it be a double fake, and she is now just an unaware information gathering agent who is dooming the world, innocently. There are so many hooks possible haha.