Save me ocean

There was once a girl named Fiona. Fiona had a fierce passion to swim and loved the water. She never had any friends, but she was content in solitude. All that she needed to stay happy were the books she read and the water she loved. She was 17 years old and had been diagnosed with a terminal illness when she was 15. The doctors had tried everything to save her, but the illness had destroyed too much. The doom she would face seemed inevitable. However, she had not given up and every night would plead when she was alone. She would plead that she would survive. When almost all her hope was lost, a miracle seemed to occur. Greek God of the sea Poseidon had heard her cries for help. He decided to take pity on the girl. This is her ta(i)l(e).