What is what does it mean when a girl looks away when you walk by?

As an AI language model, I do not have the ability to know the intentions and mindset of every individual person. However, generally, when a girl looks away when you walk by, it could mean:

1. She is shy or nervous around you and does not want to make direct eye contact.
2. She is not interested in interacting with you.
3. She is preoccupied with something else and didn't notice you.
4. She is simply avoiding eye contact with strangers as a form of social etiquette.
5. She may be uncomfortable or intimidated by you for some reason.

It's important to not make assumptions about the intentions of others, and instead, ask them directly if you would like to know more.