Dd turned 13 yesterday. As part of a combined birthday celebration with other family members, we were at little one's house yesterday. Her 5yo sister got scared playing in the dark with the big kids. At one point, she decided to try again and dd said to her that she was brave, and that she wasn't brave because she wasn't scared, but because she was scared and still came and played anyhow.
Dd said that the 5yo puffed herself up with confidence and played happily the rest of the time.