This is more a question of etiquette rather than grammar. However, I would use Ms. Mrs. is used for women who are married; and, if you don’t know the female well, you may not want to assume she is married. Ms. is acceptable for both married and unmarried women.
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Can you please help me make a colleague understand why it is incorrect to say “You and I” after a preposition, like “between”. For example, the other day she made this statement: “That’s just between Brenda and I”. I tell her it’s incorrect, that it should be Brenda and me, but she doesn’t believe me. Please help.