I was waiting for you, but you did not come.
It was already late, so she went back home.
When two or more phrases are combined together to form one complete sentence, it can be termed as compound phrases. Compound phrases are combined using words like and, for, so, but, yet, etc.
A compound sentence containing a nominative case pronoun can be "I was waiting for you, but you did not come".
A compound sentence containing an objective case pronoun can be "It was already late, so she went back home".
She must be ready to accept defeat unless her reaction shows otherwise
She stands for the nominative case pronoun while her stands for the objective case pronoun
It is not a proper noun because proper nouns are very specific things. For example the common noun= city, a proper noun could be Los Angeles because it is a specific city. It is not a personal pronoun because those are words that refer to a "person". Examples of personal pronouns are: I, you, he, she, we, them, etc. It is not an intensive pronoun because it is also not refering to a person. Examples of intensive pronouns are: himself, herself, yourself, myself. Hope this helped!