You tell her that you're looking for whatever treasure there might be to find at the bottom of the labyrinth.
"I don't know if anything like that really exists." she said, "But maybe you'll find something you'll like down there."
"W-we should get going." said Sarah.
"Have fun." the mermaid said.
"Look, the stairs." said Sarah.
You stand still, wondering if this might be a trap, considering they were so easy to find.