Her mother was a Viera adventurer, and they were doing a simple quest of gathering herbs. However her birth mother disappeared. She was but a child at the time and was lost in the forest alone. A week later she ended up being picked up by a merchant when she tried to steal some of the food he had. Feeling sympathetic he ended up taking her to a friend of his. An Elezan courtesan named Adeline who worked at a brothel. This woman was the daughter of a fallen house of nobility and became a courtesan to live and the merchant was a repeat client of hers and would do her favors from time to time. When Adeline and my oc met each other they instantly connected. She took the little girl in and over time became like mother and daughter.
They both lived in the brothel so many of the workers and the owners were like a large family to her, when her mother was working one of the other workers or brothel owners would look after her and spend time with her. Her new mother would often tell her stories of heroes and how she always wanted to meet a hero. One such story was about an old myth of a woman who saved countless lives by the name of Valkyrie and it was Adeline's favorite hero story.
Several years later Adeline grew ill. It was a sickness that rarely shows up in those of her profession and it would inevitably take her life. My character would read to Adeline her favorite stories when Adeline could no longer leave her bed. She then promised with tear filled eyes that she will become a hero herself, one that her mother could be proud of so that her mother could say she really met a hero in the afterlife. After a short time passed, her mother died from the illness. The owners of the brothel allowed her to place a grave not to far away overlooking a beautiful view of a sea of trees. On the grave stone the name Adeline Valkyrie was engraved. She decided that she would take on the name of Valkyrie and it would be a shared name between mother and daughter and their favorite hero connecting them always. Then set off for Gridiania to become an adventurer. (neither of them had last names, one likely hid it out of shame while the other forgotten since she was so young)

sorry for bad grammar, i'm half asleep while typing this.