Is HER a predictive nominative

The predicate nominative is the noun or a pronoun following a linking verb that restates or stands for the subject. The objective personal pronoun 'her' can function as a predicate nominative. Example:

The winner is her.

The possessive adjective, a Word that describes a noun. The possessive adjective 'her' can describe a noun that is a predicate nominative. Example:

The winner is her horse.