What is the Genitive Case form of 'Ihr' Personal Pronoun?

For example, the sentence "Das ist die Tasche ihrer Freundin."

The genitive case form of the possessive pronoun 'ihr' (her) corresponding to a feminine noun is 'ihrer'. In the sentence 'Das ist die Tasche ihrer Freundin', 'ihrer' is used to show possession, indicating that the friend is the owner of the bag. 'Ihr' changes to 'ihrer' in the genitive case to express this possession. Fun fact - if it was 'Ihrer' (with the first letter capitalized) then it would mean 'your' (format) not 'her'!