WHY is she acting like this?

theres this girl i thought she liked me cause her friends told me. we used 2 text alot but she never says anything more than hi when i see her at school. i catch her looking at me when i p her in the hall but she neva approaches me. then when i try to talk to her in her cl she acts really weird and cant look me in the eyes. its kinda annoying cause i want to get to know her