female principal; headmistress
Refers to a woman who is the principal of a school. The term is straightforward and neutral.
彼女はその学校の女校長です。
She is the female principal of that school.
新しい女校長が着任した。
The new headmistress has taken up her post.
Compound of 女 (おんな, 'woman') and 校長 (こうちょう, 'principal').