Her is a pronoun that is used in the object position, not as a subject, or a possessive adjective that describes a subject or an object noun.
He loves her. (object of the verb)
He speaks to her. (object of the preposition)
Jane forgot her hat and gloves on that cold night. (a possessive adjective)
The noun 'mice' is the plural form of the singular noun 'mouse'.
The noun 'circus' is a singular noun.The plural noun is 'circuses'.
The noun juggler is a singular noun. The plural noun is jugglers.
Statistics is plural, the singular form is statistic.
The word moon is a singular noun. The plural noun is moons.
The noun 'mice' is the plural form of the singular noun 'mouse'.
The singular noun is "louse" and the plural noun is "lice."
noun that are plural in form but singular in meaning
The noun children is the plural form of the singular noun child.
The noun 'circus' is a singular noun.The plural noun is 'circuses'.
The noun juggler is a singular noun. The plural noun is jugglers.
The singular noun is trio; the plural noun is trios.
The singular noun is Tuesday.The plural noun is Tuesdays.
The noun 'orchid' is a singular noun, a word for one.The plural noun is 'orchids'.
The noun mailbox is the singular form; the plural is mailboxes.
Statistics is plural, the singular form is statistic.
No, Mice is a plural noun. Mouse is the singular noun.