What is what does it mean when a girl says hi?

As an AI language model, I don't have access to real-life situations to give a specific answer. However, in most cases, when a girl says "hi," it's a common greeting or way of saying hello. It could indicate that she is being friendly or polite to you. It can also mean that she's trying to start a conversation or initiate interaction with you. However, the exact meaning of "hi" can vary depending on the context, tone of voice, and body language used.