[4] Kerolin was among several promising young footballers to emerge from the youth system of Valinhos Futebol Clube, a women's team run by the local authority's sports and leisure department and coached by Ana Lúcia Gonçalves.

[6] When Associação Atlética Ponte Preta decided to form a women's section in 2017, they took over the Valinhos club, with 17-year-old Kerolin among the squad they inherited.

[12] In January 2019 Kerolin agreed the transfer to Palmeiras, signing a one-year contract and joining up again with her previous coach Ana Lúcia Gonçalves.

She remained provisionally suspended by CONMEBOL in July 2019, when Palmeiras's coach Gonçalves was sacked on suspicion of involvement in doping cases affecting the clubs she had worked at and inappropriately acting as a sports agent for the players in her charge.

She joined several other Brazilian players at the Spanish Primera División club, and thanked God for the opportunity to restart her football career.

[18] She scored her first goal for the Courage in the Challenge Cup final, opening in a 2–1 win over the Washington Spirit and being named the most valuable player of the match.

[23] Her tally of 10 regular-season goals was second only to Golden Boot winner Sophia Smith, leading the Courage to finish the regular season third in the standings.

[24] However, she suffered an anterior cruciate ligament tear days before the playoffs, and the Courage lost to eventual champions NJ/NY Gotham FC in the opening round.

[32] The senior Brazil women's national football team head coach Vadão called Kerolin up for the first time in September 2018, for a friendly match against England at Meadow Lane, Nottingham.

"[35] Kerolin was not eligible to play at the 2019 FIFA Women's World Cup because she was provisionally suspended from football and still awaiting the final judgement from CONMEBOL in respect of her failed doping tests.

[4] On 6 January 2021, Kerolin's suspension ended and she was called into a national team training camp for evaluation by Brazil's new coach Pia Sundhage.