"Bravery"

• simile-"Dr. Cable's pendant seemed to grow heavier and heavier, wound around her neck as tightly as the vines, brush, and roots grasping the railroad tracks." page 243
• imagery - "In the valley below, the orchids glowed with pale malevolence in the moonlight, a frozen sea against the dark shore of the forest." page 245
• personification " She thought of the orchids spreading across the plains below, choking the life out of other plants, out of the soil itself, selfish and unstoppable." page 244

I think it requires bravery to meet anyone new, especially if you do not know the people. First impressions are very important. People say they remember you most for the first thing you say to them. In Tally's case, she has a secret and she has to hide her secret, and be "judged" by David's parents. This would require her to be brave face this unknown situation.