Why did she pack a bag, grab her key and leave the house?

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It was late at night in Shelby, North Carolina when Asha Degree got out of bed, quietly packed some things and left her home. Her brother, O'Bryant, who was sleeping in a bed in the same room, thought that his sister had just gotten up to use the bathroom. Her mother, Iquilla, looked in on her children early the next morning and thought that maybe Asha had gone downstairs. She wasn't there. Asha's grandmother lived across the street so they called over to her house but the grandmother hadn't seen her either. That's when Iquilla threw the phone at her husband, threw open the door and ran down the road screaming her child's name. Asha would be seen by a few people that night but none of them had actively tried to stop her. One man, a trucker, had turned around and followed her for a little ways intent on seeing if she needed help but the girl ran into the woods and he hadn't followed. Her home life was pleasant and she was a happy child. Why then, had she left? No sign of forced entry, no sign that she had been taken against her will. She took her house key with her, which gives the illusion that she had intended to come home again. She had been reading "The Whipping Boy" By Sid Fleischman in school. It is a children's book about two kids who run away from home but eventually return. Was that her intention? To go on an adventure but return?