Alone girl in Fields

You could describe her with having sad eyes? She could be one to keep to herself. She walks about as though in deep thought, as though her thoughts are her only company. She maybe timid, she maybe shy. When she smiles, it's usually faint, it's usually tinged with a bit of sadness to it. If she is lonely, she would be sad. But it doesn't necessarily mean that being alone is sad, but lonely indicates she would be sad because loneliness craves to have company.