The British Olympic bronze medallist's year has been blighted by personal misfortune, with her mother being diagnosed with cancer in January and her father undergoing brain surgery last month.
She wanted to withdraw from the team to focus on spending time with her parents but both insisted that she compete.
And Stevenson rewarded them with a semi-final victory over home favourite Hwang Kyung-seon, the reigning World and Olympic champion in the 67kg class.
That guaranteed a silver and Stevenson upgraded in style with a referee's decision victory over China's Yunfei Guo in the final, after he ruled the British fighter was more pro-active.
"I was so close to not coming to the World Championships because I didn't want to leave my parents alone," said Stevenson.
"My family came together to help and I went out there to win it for them. This is an amazing feeling."
The win was Stevenson's third world title and it follows a decade after she became the first British woman to win gold at the event.
"Sarah is an inspiration to us all," said British performance director Gary Hall
"To achieve what she has with everything that's gone on is amazing. She is a true champion and to have her in the team is a boost to all the fighters."