Lake broke the 29-year-old UK Under 17 high jump record, clearing 1.90 m in 2013, and broke the 23-year-old UK Under 20 high jump record with 1.93m in 2014. She also broke the world indoor pentathlon youth (under-18) record in 2014, with a score of 4284 points. At the 2016 Olympic Games in Rio, she became the first British woman to reach an Olympic high jump final since Debbie Marti in 1992. In 2018, she finished fourth at the World Indoor Championships and won her first senior silver medal at the Commonwealth Games.