Is she playing hard to get?

Maybe, or maybe she just doesn't want to be "got" by you.

Sometimes a girl can play hard to get if they think you're taking less notice of her and/or she needs some attention.

When a girl plays 'hard to get' they usually use their body language, speech and contact. For example;

If a girl has their arms folded and her hair hiding her face, she is preventing eye contact.

If a girl is sitting far away from you, with their face turned the other way, she is preventing contact and the above again.

Sometimes a girl might just not like you though, and you should move on.