What is antecedent pronoun for her?

You need more context to determine the antecedent for "her." An antecedent is the noun or noun phrase that a pronoun refers to.

For example, in the sentence:

"The girl went to the store. Her mom was waiting for her."

The antecedent of "her" is "the girl."

Please provide the sentence or context in which "her" appears so I can help you find the antecedent.