Early career Malecki made her amateur debut against Helin Paara at International Ring Fight Arena 12. She won the fight by a second-round technical knockout. Malecki made her professional debut against Faith Davis, for the inaugural for the ExciteFight MMA Featherweight title, at ExciteFight Conquest of the Cage on November 4, 2017. Malecki won the fight by a first-round submission. Malecki was scheduled to fight the debuting Tracy Smith at Conquest of the Cage on February 2, 2018. Malecki won the fight by a technical knockout, stopping her opponent after just 22 seconds. On July 11, 2018, it was revealed that Malecki would be one of the fighters featured on
The Ultimate Fighter: Heavy Hitters. She was the sixth pick for Team Gastelum. Malecki lost the quarterfinal bout against
Leah Letson by unanimous decision.
Ultimate Fighting Championship Malecki made her promotional debut against Duda Santana at
UFC Fight Night: Gustafsson vs. Smith on June 1, 2019. She won the fight via second-round submission. Following this loss, Duda tested positive for
ligandrol in an out-of-competition test. She made her second appearance in the organization against
Veronica Macedo at
UFC Fight Night: Lee vs. Oliveira on March 14, 2020. She won the fight via unanimous decision. Malecki was expected to face
Tracy Cortez at
UFC Fight Night 179 on October 11, 2020. However, Malecki withdrew from the bout and was replaced by Stephanie Egger. Malecki was then scheduled to face
Norma Dumont at
UFC on ABC 2 on April 10, 2021. However, she withdrew from the bout due to a undisclosed reason and was replaced by
Erin Blanchfield. Malecki faced
Josiane Nunes at
UFC on ESPN: Cannonier vs. Gastelum on August 21, 2021. She lost the fight via knockout in round one. On June 8, 2023, it was announced that Malecki was no longer on the UFC roster after she indicated she wanted to move up in weight but UFC conveyed they were no longer interested in having a Women's Featherweight division. == Championships and accomplishments ==