[1] She competed on the advanced novice level in the 2012–2013 season, winning silver at the Finnish Championships and bronze at the Triglav Trophy.

Coached by Virpi Horttana at Espoon Jäätaiturit, Lindfors debuted on the ISU Junior Grand Prix (JGP) series, placing eighteenth at an October event in Zagreb, Croatia.

[6] She qualified for the free skate by placing eleventh in the short program and finished eighth overall in her ISU Championship debut.

In March, Lindfors placed twenty-fifth in the short program at the 2016 World Junior Championships in Debrecen, Hungary; she missed the cut-off for the free skate by one spot.

At the 2017 Finnish Championships she won the bronze medal behind Emmi Peltonen and Jenni Saarinen, placing second in the short program and third in the free skate.

[9] After placing tenth at the 2017 ISU Junior Grand Prix in Latvia, Lindfors competed at the 2017 CS Nebelhorn Trophy, the final qualifying opportunity for the 2018 Winter Olympics.

In January, at the 2019 European Championships in Minsk, Lindfors placed fourth in the short program, 0.03 points behind Alexia Paganini.

"[11] Lindfors was named as Finland's sole ladies' entry to the 2019 World Championships in Saitama, but she subsequently withdrew due to injury.

[12] Lindfors initially planned to compete at the 2019 CS Finlandia Trophy, but withdrew due to ongoing back problems.