Diachenko appeared in her first senior international competition at the Miss Valentine Cup finishing 4th in the all-around. On March 17–19, Diachenko competed at the Kiev Grand Prix finishing 7th in the all-around. Her next competition was at Thiais Grand Prix where she finished 11th in the all-around. On March 31 - April 2, Diacehnko then competed at the 2017 Grand Prix Marbella finishing 11th in the all-around and qualified to 2 apparatus final. Diachenko appeared in her first World Cup event at the 2017 Pesaro World Cup where she finished 19th in the all-around. She then competed at the 2017 Tashkent World Cup finishing 14th in the all-around and qualified to the ball final. Her next competition was at the 2017 Baku World Cup where she finished 10th in the all-around. On May 19–21, Diachenko along with teammates Viktoria Mazur and Yeva Meleshchuk represented the individual seniors for Ukraine at the 2017 European Championships. On June 23–25, Diachenko competed at the 2017 Grand Prix Holon finishing 7th in the all-around. On July 7–9, Diachenko finished 6th in the all-around behind Sabina Ashirbayeva at the 2017 Berlin World Challenge Cup, she qualified in ball final finishing in 6th and won her first World Cup medal, a bronze in hoop. Diachenko competed at the quadrennial held 2017 World Games in Wrocław, Poland from July 20–30, however she did not advance to any of the apparatus finals. On August 5–7, Duachenko finished 9th in the all-around at the 2017 Minsk World Challenge Cup, she qualified in 2 apparatus finals finishing 4th in hoop and 8th in ball. On August 30 - September 3, at the 2017 World Championships in Pesaro, Italy; Diachenko finished 19th in the all-around finals.