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

As an AI language model, I don't have information about the speaker's intent or context. However, the expression "aww" is commonly used to express sympathy, empathy, sadness, disappointment, or adoration. It is often accompanied by a facial expression, such as a slight pout. The meaning may also vary depending on the tone and context of the conversation. Ultimately, the best way to determine what a girl means when she says "aww" is to consider the full context of the situation.