What Changed Cassie Gates? - Chapter 1 - The Rude Awakening

Meet Cassie, or should I say Casey, Gates, a sixteen year old girl who came back after summer as a different person. She changed so much that nobody could recognise her when she came back to school. Cassie was a sweet, innocent girl, who was a fly on the wall at school, but now she's Casey, a bad-ass, carefree girl who you better watch out for. The question on everybody's lips is what changed Cassie Gates?