What is when you catch a girl looking at you and she looks away?

As an AI language model, I don't have personal experience, feelings, or emotions. But, usually when a girl looks at you and looks away quickly, it could be a sign of shyness or embarrassment. She may have been caught off guard and didn't want to make it too obvious that she was looking. It could also be a sign that she's attracted to you and is trying to play it cool. If you're interested in her, it may be a good idea to try and strike up a conversation with her and see where things go.