she, her
她 centers on the feminine third person: she or her. It is a straightforward pronoun with no abstract extensions.
她 is a modern Chinese creation combining 女 (woman) with 也, which likely contributes a phonetic element. It was developed as a feminine counterpart to 他.
The woman radical 女 beside 也 points to a female person: she or her.
For チ, imagine a tea party where she is the host: tea -> チ, and she pours tea for her guests.