There are many versions of this story but my family learned this story.
Once there was this beautiful women that wanted to marry a handsome man. She already had kids with her other husband but the man didn't want those children. So in order to marry him, she drowned her kids.
Another story was that she was married to this man. They couldn't afford to care for child. So when she would have a baby her husband would drowned them in the river. So now she looks for them.