1. Mademoiselle: This is the formal, polite way to address an unmarried woman. It literally means "young lady."
2. Manquer: This means "to miss" in the sense of not being present, or not achieving something.
So, if you want to say "I miss you," you would use "Je te manque."
If you are referring to a young woman and want to say "Miss Jones," you would say "Mademoiselle Jones."