在一篇英文文章中找出一个特定单词的出现次数并直接输出这个数字。


文章：Maya Angelou was an American poet. She published many books throughout her life, and her autobiography I Know Why the Caged Bird Sings is a classic. Her writing discusses themes of racism, identity, and family.
关键词：her
在上述文章中，关键词 "her" 出现了 3 次。