Note: 'Hers' is a third person possessive pronoun.
1.
You use ~ to indicate that something belongs or relates to a woman, girl, or female animal.
His hand as it shook ~ was warm and firm...
He’d never seen eyes as green as ~...
Professor Camm was a great friend of ~...
PRON
2.
In written English, ~ is sometimes used to refer to a person without saying whether that person is a man or a woman. Some people dislike this use and prefer to use ‘his or ~’ or ‘theirs’.
The author can report other people’s results which more or less agree with ~.
PRON
3.
Hers is sometimes used to refer to a country or nation. (FORMAL or WRITTEN)
PRON