Garnbret emerged as the overall winner at the penultimate event of the World Cup in China's Wujiang on Sunday after the finals were annulled for safety reasons due to rain.
This was the fourth World Cup win in the lead discipline for the 19-year-old this season and the sixth career win in the discipline.
With the finals annulled, the rankings were based on the semi-finals in which Garnbret was tied with Jain Kim of South Korea in first place, followed by Austria's Jessica Pilz in third.
In the finals, both Garnbret and Kim slipped and fell on the same hold, which is why a complaint was lodged for annulment. Pilz would have won the competition had the finals not been annulled.
In the overall rankings, Garnbret now has 550 points, an unassailable lead of 90 points ahead of Pilz, who finished third.
"It's great. I'm happy to have made it for the third time running. I worked hard to succeed again," Garnbret said, adding she was looking forward to another good climb at the final event in Xiamen next Sunday.
"It wasn't great to win in such a way ... there was an awkward situation with rain and all, so this isn't a victory I could enjoy properly," she said about the finals being annulled because the wall was not protected well enough from rain.
Garnbret won the World Climbing Championships in the combined and bouldering disciplines in Innsbruck in September to become the first sports climber in history to win world champion titles in three events, having already won the lead title in Paris two years ago.
