She told me that I was kind to her.

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Does 'her' refers to 'she'?
Or does her refers another female?

Her refers to she.

The sentence isn't clear about the antecedent for "her."

To determine whether "her" refers to the same person as "she" or to another female, let's analyze the sentence:

"She told me that I was kind to her."

In this sentence, "she" is the subject who told the speaker that they were kind. The pronoun "her" is used as an object pronoun, indicating that someone was kind to a person referred to by "her."

Without further context, we cannot conclusively determine whether "her" refers to the same person as "she" or to another female. However, based on the sentence alone, we can infer that "her" likely refers to a different female than the subject "she."