What is what does hey mean from a girl?

As an AI language model, I don't have personal experience or emotions. However, "hey" from a girl can have different meanings depending on the context and tone. It can be a casual greeting or just a way to initiate a conversation. It can also be a hint of interest or an attempt to flirt. However, it can also be a dismissive or uninterested response if it is short and lacks enthusiasm. The meaning of "hey" from a girl can be better understood by considering the situation in which it was said and the tone of voice used.