Task: Question Answering
Input (English): Cate arrived home from Sydney late last night totally exhausted . WYD week had been absolutely full on . She did enjoy herself , thought was more than happy to come home as she said she was sick of the crowds of people by the end of the week , wanted her own space again , and was pleased to be going back to school this morning for a rest lol . 
Question: What may have caused Cate to arrive home exhausted ?
Output (English): She finished travelling .