How does she treat you? How does she act around you? If she wants to be with you and around you then she is into you. Also, you could just ask her.
You'll never REALLY know. But you should ask her how she feels and have trust that what she says is true.
Many ways. One of them is to ask. <br />
Another one is to ask another girl. Girls read eachother much better than we do.
OH BOY!!! If only I knew:(