‑고 말다
Attach -고 말다 to a verb stem to show that something happened completely, often by accident or with an unwanted result. In the story, '길을 잃고 말았다' means that she ended up getting lost. You can reuse this pattern in many everyday situations. Example: '시장에서 길을 잃고 말았어요.'
시장에서 길을 잃고 말았어요.
I ended up getting lost at the market.
