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

When a girl says "hehe," it typically means that she is mildly amused by something or trying to be playful. It can also be a way to indicate that a statement or message is meant to be lighthearted or not to be taken too seriously. In general, the use of "hehe" is more common among younger individuals and in informal communication such as text messaging or social media.