Responses
According to the recent flashback, she "died" at least over 100 years old.
And since it seems she only had the recent memory show up just a few chapter ago, she does not have complete memories of her "past"
After all, she is still debating whether the story of her "past life" is actually real or not. I imagine it to be a young child get read a story of "her" 100 years life. She'll have at least grown a little than her age, but I would imagine she would still be childish since her physical and brain development is still that of a 10 year old....a 6 year old looking 10 year old since she was abuse to look younger.
wait i thought the fl is thousands of years old??? and like she's just inside a small body but her mind is mature but obvi not cause she lost her memories???? Didn't the skeleton demon thingy said something about her mind not being compatible with her body??? I don't think she's a kid???