She left school early, walked a few blocks away to catch a bus so no one would see her taking the bus. She left her cell phone and car behind, but carried a duffel bag and took a bus to the end of the line, which happens to be a woodsy area. Obviously, she intentionally left. There are only so many reasons for this behavior: running away from her life after a break down; running away with a secret lover; and suicide. I pray it is #2.