Modern day drama romance with a Greek god.

Female protagonist(possibly named Grace Murphy, unsure). Has a son that might of been frail or sick if I remember correctly. Becomes entangled with the Greek gods. Explains the Greek gods are more like highly evolved humanoids with powers that seem like magic but is actually just more advanced scientific understanding of the universe and genetics. Protagonist gets in a relationship with Hephaestus. I read it as an ebook on Amazon Kindle I believe sometime between 2012 and 2019.