(Guardian cosmos is her advisor btw, in my fanfic she was the spirit of the old guard, aka her mother who passed away from dying in battle. Her father passed away trying to save her mother)
After the passing of both her parents, queen serenity found her useless to the rest of the guardians, because she was orphaned at a young age, and she doesn’t even remember her parents.
So queen serenity raised her to think she was her mother, but mistreated her because she wasn’t her biological daughter like princess serenity. So yeah pretty harsh already
When she came of age, she was taken to the galaxy cauldron to guard. There she would spend the rest of her eternal life. (She was invincible and immortal so she can’t die..)
So yeah she had a very dark backstory…