The prompt is about unanswered questions. This however, is not an invitation to leave the reader with unanswered questions. It's a good idea to wrap a story up with a resolution. In this case, the conflict arose when the girl noticed a woman who resembled her. Was this the girl's mother? That conflict should be resolved in some way by the end of the story. That would be a complete story arc.
Your writing is effective. We hope to make it more effective with this suggestion.
Thank you for your correction, I will do better next time.