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Below are rules to show you how to use possessive pronouns.
Apostrophes are not added to possessive pronouns because they are already in their possessive form. 
Possessive Pronouns
Incorrect: her's or hers'

correct: hers

Possessive pronouns are used to show who or what owns something. 

Remember that a possessive pronoun can replace a possessive adjective and a noun to avoid repeating information that has already been made clear.
Theirs can replace their car. 

Hers can replace her brush
A possessive adjective appears in front of a noun as in: 

                                That is their car.   (possessive adjective their + noun car

A possesive pronoun replaces a possessive adjective and a noun.

                                That is theirs.     (possessive pronoun)
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Language Arts:  Possessive Pronouns