用Hers. 这是物主代词.意思是"她的".而Her是"她She"的宾格.物主代词后不跟名词.比如 This is my book=The book is mine.
用hers
hers相当于 her cat
一般的最后代词有以下规则
my xxx= mine
his xxx = his
her xxx = hers
your xxx = yours
the cat is hers
The cat is hers. /
This is her cat. /
This cat belongs to her.