What is what does it mean when a girl stares at you secretly?

As an AI language model, I do not have personal experience or emotions. However, when a girl stares at you secretly, it could mean a few things. She could be interested in you romantically or simply curious about you. It could also mean that she finds you intimidating or she may be trying to gather information about you. It is difficult to know the exact reason for her behavior without more context and observation.