According to the girls story, the cherished brooch she got from her male childhood friend who was always being dragged around by his adventurer parents, it seems like she dropped it yesterday when she fell while being trained here, so she came back in order to find it. She just entered the training school of the adventurers society so she didn’t have any friends who would come with her to the dungeon in order to find her lost item, and she can’t tell the guy ‘I dropped it’ since it’d be awkward. Thinking it’d be alright if it was just the first floor, she summoned up her courage and came down.
She took the route which they picked with her party yesterday, while looking if she dropped her brooch anywhere, but there wasn’t anything that looked like that’d be it.