Here are some options, depending on the context:
Informal:
* Mi niña: This means "my little girl" and is a very affectionate term.
* Chica: This is a general word for "girl" but can be used in a flirty way.
* Nena: This is a common slang term for "girl" and is more playful than "chica."
* Princesa: This means "princess" and is a very sweet and affectionate term.
* Cariño: This means "dear" or "honey" and is a very common term of endearment.
Formal:
* Señorita: This is the formal word for "Miss" or "young lady."
It's important to note that the best translation will depend on the specific context and the relationship between the speakers. For example, "mi niña" would be more appropriate for a boyfriend addressing his girlfriend, while "señorita" would be more appropriate for a stranger addressing a young woman.