Categorize this sentence into a specific emotion: She felt left out of the group.
This sentence could be categorized as feeling of loneliness, isolation, or exclusion.
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Categorize this sentence into a specific emotion: She felt left out of the group.

### Response:
This sentence could be categorized as feeling of loneliness, isolation, or exclusion.