Three reasons

Abi had arrived home late in the night and was glad that her grandparents were already asleep. Her father was the one who let her inside.

Andrew saw her puffy, red eyes but all he asked was if she was alright. Abi told him she was fine, that she was just a little upset and her dad didn't ask anymore. He looked like he understood her and he just led her to her room, telling her to have a rest.

Abi tried to sleep and she did after a few hours of sobbing quietly, but she woke up at 3 am and started crying again. She couldn't go back to sleep again because her mind was too chaotic, with so many thoughts running around like headless chickens, so she stood up and opened the window. The moon was no longer there. No stars even. The sky was dark, as hollow and lifeless as her insides.