Here's why:
* "Hola pequeña" is generally a friendly and informal greeting, usually used with children or someone you are close to.
* Adding "Nina" makes it more specific, but it might come across as a bit patronizing, especially if you're not very close to Nina.
* "Pequeña" can sometimes be perceived as diminutive and can sound condescending. It's not a universally accepted term of endearment.
Consider these alternatives:
* "Hola Nina" is a simple and respectful greeting.
* "Hola, Nina, ¿cómo estás?" (Hello, Nina, how are you?) is a more formal and polite way to address her.
Ultimately, the best greeting depends on your relationship with Nina and the situation. It's always a good idea to be mindful of how your words might be interpreted.