that or those belonging to her: the possessive form of she, used without a following noun, often after of: that book is hers; hers are better; he is a friend of hers
Origin of hersLate Middle English hires, hers ; from hire, her(e), possessive adjective (see her) + -s after his
pron.(used with a sing. or pl. verb)
Used to indicate the one or ones belonging to her: If you can't find your hat, take hers.
Origin of hersMiddle English hires, hirs : hire, her; see her + -es, possessive suff.; see –'s.
her + -'s