What is what does it mean when a girl calls you silly?

As an AI language model, I don't have any specific insight into the context or tone of the situation, but typically when a girl calls you silly, it tends to imply playfulness, affection or humor. It could also mean that she sees you as being playful, goofy, or simply fun to be around. Similarly, it can be playful teasing that could convey a sense of comfort and that both parties share a good rapport. Alternatively, it could indicate that she is not taking you seriously, or she's trying to lighten up the mood in a cheerful way. Ultimately, the meaning of being called "silly" really depends on the person, the situation, and the context.