Anna is running to push Beth (later known as WaterWoman) in to the pool
Once she was pushed in they noticed her body was going invisible. This is when she discovered she was not normal.
Before her parents died they told her sister to keep Beth away from bodies of water. Her sister was then killed for experimentation.
She will always be considered a hero for saving lives of drowning people.
WaterWoman is able to be invisible under water and swim as fast as the speed of light. She cannot be underwater for longer than an hour and her shadow is visible to the animals under her in the ocean.
She continues being a hero and saves thousands of lives from possible death in the water.