Below is a rule to show you how to use object pronouns.
To decide whether to use the subject pronoun or the object pronoun, try removing the distracting parts of the sentence.
The gift was for you and her.
To figure out which pronoun to use, eliminate the words you and.
The gift was for her - correct
(her - object pronoun)
The gift was for she - incorrect
(she - subject pronoun)
Language Arts: Object Pronouns