Final answer:
Lily Dyer decided to leave the gathering because she felt it was time to go home, indicating a deliberate choice rather than a sudden or escorted departure.
Step-by-step explanation:
Based on the information provided, it appears that Lily Dyer decided to leave because she felt it was time to go home. In the conversation between Joe Dagget and Lily, she expresses her decision to leave, saying, "This must be put a stop to. We've stayed here long enough. I'm going home." This interaction suggests that Lily made the choice on her own rather than being escorted out or leaving after further involvement in activities. Her departure seems quite deliberate and is marked by her assertion that it's time to stop and go home, rather than being a hurried or impromptu decision.