Razýmová started in Horní Mísečky for the first time in the Slavic Cup in December 2012 and finished 34th over 10 km freestyle and over 5 km classic. In January 2014, she made her debut in Nové Město in the cross-country skiing world cup and achieved 66th place in the sprint. Her best results at the Winter Universiade 2015 in Štrbské Pleso were 20th place in the 15 km mass start race and fifth place with the relay. At the beginning of the 2016/17 season she came in 56th place in the World Cup mini tour in Lillehammer . In January 2017 she became Czech champion over 5 km in Nové Město and took third place over 10 km freestyle at the Alpencup in Zwiesel . At the Nordic World Ski Championships 2017 in Lahti , she took 28th place over 10 km classic, 27th place in the skiathlon and 30 km mass start race and 11th place with the relay. In March 2017 she won her first Slavic Cup victory in the 10 km mass start race in Harrachov . She also came third in the sprint there. At the Tour de Ski 2017/18 , which she finished in 32nd place, she got her first World Cup points with 24th place on the final stage in Fiemme Valley . Her best results at the 2018 Winter Olympics in Pyeongchang were 23rd place in the 30 km mass start race and 11th place with the relay and together with Petra Nováková in the team sprint.
In the 2018/19 season, Razýmová finished 48th in the Lillehammer Triple and 23rd in the 2018/19 Tour de Ski , making it 60th in the overall World Cup. At the season highlight, the Nordic World Ski Championships 2019 in Seefeld in Tirol , she came in 37th place in the 30 km mass start race and over 10 km in classic, 29th place in the skiathlon and 11th place in the relay. In the following season, she achieved 28th place in the overall World Cup with five top ten placements.
Participation in World Championships and Olympic Winter Games
Olympic games
2018 Pyeongchang : 11th place relay, 11th place team sprint freestyle, 23rd place 30 km classic mass start, 26th place sprint freestyle, 38th place 15 km skiathlon, 45th place 10 km freestyle
Nordic World Ski Championships
2017 Lahti : 11th place relay, 27th place 30 km freestyle mass start, 27th place 15 km skiathlon, 28th place 10 km classic
2019 Seefeld in Tirol : 11th place relay, 29th place 15 km skiathlon, 37th place 30 km freestyle mass start, 37th place 10 km classic
Czech Republic
Prémanon
Oberwiesenthal