Most Helpful Girl
Sounds like she's playing hard to get either that or she's making you jealous. This behavior I recognize from my own behavior. When a guy seems intrested we have two options 1.) to make him want us even more so we can get them to make a move. 2.) we try and make them jealous to test the waters. The best thing you can do is mirror her behavior and see how she reacts. What ever you do don't make it obvious girls will know for sure if you are. Pretend like she's not in the hall and just have a friend to walk with its a known fact it makes you look hard to get when you are with your friends.