What does it mean for a girl to show her head?

Comfort and encouragement, intimacy and care.

1, comfort and encouragement: Touching the head expression means that girls are comforting or encouraging each other and expressing their concern and comfort for each other.

2. Intimacy and concern: The expression of touching the head indicates that the girl is intimate and concerned about the other party, and the girl feels that the other party is a trustworthy and dependent person.