She fought primarily for the Poland-based KSW promotion - where she was the Flyweight champion - and also made her U.S. debut for Invicta FC in November 2014.

[8] Kowalkiewicz next faced Heather Jo Clark on May 8, 2016 at UFC Fight Night 87 in Rotterdam, Netherlands.

[10] Kowalkiewicz defeated Rose Namajunas by split decision on July 30, 2016 at UFC 201 to earn the next title shot at then-champion Joanna Jędrzejczyk.

[12] Kowalkiewicz fought for the Strawweight title and lost to champion Joanna Jędrzejczyk by unanimous decision on November 12, 2016 at UFC 205.

[13] Kowalkiewicz faced Cláudia Gadelha on June 3, 2017 in the co-main event at UFC 212.

[14] Kowalkiewicz faced Jodie Esquibel on October 21, 2017 at UFC Fight Night: Cerrone vs.

[24] Kowalkiewicz faced Yan Xiaonan on February 23, 2020 at UFC Fight Night 168.

[28] After a one-year hiatus, Kowalkiewicz faced Felice Herrig on June 4, 2022, at UFC Fight Night 207.

[29] Kowalkiewicz snapped a 5 bout losing streak, submitting Herrig via rear-naked choke in the second round.

[35] Kowalkiewicz faced Diana Belbiţă at UFC Fight Night 229 on October 7, 2023.

Her injuries were so severe that she couldn't return home from New Zealand, forced to wear an eye patch and stay for a few days.