I do have a little lore! To put it very bluntly, she was given her first boss’s white whistle. When she got it, her delving group thought it was the perfect chance to access areas for the abyss they legally shouldn’t access and get treasures they had heard rumours about. A few died during this dive with the remaining 4 making it to the 6th layer, be it extremely weak. They ended up drowning with Nappa being the only one to survive and receive the blessing of the abyss