Why did you think Miss Debenham was so concerned about missing her connection for the Simplon Orient Express train?

Miss Debenham was likely concerned about missing her connection for the Simplon Orient Express because it represented not only a crucial part of her travel plans but also her desire to maintain a specific schedule. The train's reputation for luxury and punctuality added to the urgency of her situation, as missing it could lead to significant disruptions in her journey. Additionally, her demeanor suggested that she was a person who valued order and reliability, making the prospect of missing the train all the more distressing.