Carpenter is from Caerphilly, South Wales. She was inspired to take up the sport by her father, Jason, a BMX track builder who is also her coach. Carpenter attended St. Martin's Comprehensive School, Caerphilly and is taking a gap year to concentrate on her sport before studying a science and Spanish degree in Manchester.
She became a double world champion in 2014, winning the UCI Mountain Bike World Championship and the UCI World Cup Mountain Bike Downhill Series. She was also named Elite Cyclist of the Year at the USN Welsh Cycling Awards.