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Correct: She and her friend came over.

Incorrect: I invited he and his wife.
If we remove and his wife, we're left with the ungrammatical I invited he.
Correct: I invited him and his wife.

Incorrect: Bill asked my sister and I.
If we remove my sister and, we're left with the ungrammatical Bill asked I.
Correct: Bill asked my sister and me.

Rule 13. If two people possess the same item, and one of the joint owners is written as a pronoun,
use the possessive form for both.

Incorrect: Maribel and my home
Incorrect: Mine and Maribel's home
Correct: Maribel's and my home
Incorrect: he and Maribel's home

Incorrect: him and Maribel's home
Correct: his and Maribel's home

Incorrect: you and Maribel's home
Incorrect: yours and Maribel's home
Correct: Maribel's and your home

Note: As the above examples demonstrate, when one of the co-owners is written as a pronoun,
use possessive adjectives (my, your, her, our, their). Avoid possessive
pronouns (mine, yours, hers, ours, theirs) in such constructions.

NOTE
Do not combine a subject pronoun and an object pronoun in phrases like her and I or he and me.
Whenever and or or links an object pronoun (her, me) and a subject pronoun (he, I), one of those

pronouns will always be wrong.
Incorrect: Her and I went home.
Correct: She and I went home. (She went and I went.)