The character 她们 is formed by combining two existing components: the singular feminine pronoun 她 (tā, meaning "she"), which itself is constructed from the woman radical 女 paired with the phonetic element 也, and then directly appending the plural suffix 们 (men), which is commonly added to personal pronouns and nouns for people to denote a group. The formation is thus a straightforward, agglutinative joining of a specific singular base with a general plural marker, creating a new word that specifically indicates a feminine plural.