Why would an unmarried woman wear a kippah?

An unmarried woman might wear a yarmulke (also called a kippah) at different times depending on her community and personal conviction, such as during prayer, studying Torah, participating in religious services, or to express feminist or egalitarian beliefs.  While the mainstream custom in many communities, including Orthodox Judaism, has been for unmarried women not to wear kippot, more liberal communities and individuals may adopt this practice as a personal symbol or as a statement of equality.

Yesterday, during the blowing of the ram's horn to celebrate the beginning of the Jewish New Year (for year 5786 — which is 2025-2026), I noticed one of my friends wearing a kippah.  I do not remember ever seeing her wear one, so I searched online for an answer to my question in the title.  She was participating in a special service to bring in the Jewish new year and chose to wear a kippah.