Pirelli has committed to using her platform as a sportswoman to speak out about the impact of climate change as an EcoAthlete Champion, saying that growing up surrounded by wildlife has made her eager to protect it. In November 2023, she was named one of the BBC100 Women 2023 for her sporting achievements and climate activism.[2]
A national record in the heptathlon came at the 2010 South American Games/South American U23 Championships, where she was the bronze medallist with a score of 5118 points.[11] She performed at two major events in 2011: a score of 5115 points brought her fourth at the 2011 South American Championships in Athletics and a new national record of 5157 points placed her ninth at the 2011 Pan American Games.[12] She set school records when competing for the Oral Roberts Golden Eagles in collegiate competition in 2012: a score of 3765 for the indoor pentathlon preceded a win at The Summit League championship outdoors in a record score of 5254 points in the heptathlon. In addition to this, she set a javelin throw record of 48.75 m (159 ft 11+1⁄4 in) at the NCAA preliminaries.[13] She improved her national record further in international competition that year as she managed 5479 points for fifth place at the 2012 Ibero-American Championships – her mark of 13.91 m (45 ft 7+1⁄2 in) in the shot put was also an outright national record.[12]
Pirelli graduated from Oral Roberts University with a degree in biology in 2012 and was the highest academic performer among the school's student athletes that year.[14]
Multiple record holder
The 2013 season saw Pirelli establish herself among the best ever female athletes from Paraguay. Over the course of the year, she broke the national records in the 200 m (24.64 seconds), 400 metres (56.94 seconds), indoor 800 metres (2:20.44 minutes), 60 metres hurdles (8.79 seconds), 100 metres hurdles (13.70 seconds), indoor long jump (5.67 m), the indoor pentathlon (4032 points) and the heptathlon (5733 points).[12] At the start of the year her pentathlon performance topped the rankings at the Austrian indoor championships and her score ranked ahead of the former South American record held by Themys Zambrzycki,[15] which had been broken by Vanessa Spinola earlier that month.[16] She gave four heptathlon performances outdoors that year. She set a new best of 5617 points at the Brazilian combined events cup in April,[12] then improved to 5683 points to take second place at the 2013 Pan American Combined Events Cup behind Cuba's Yorgelis Rodríguez.[17] She was runner-up to Brazil's Tamara de Souza at the 2013 South American Championships in Athletics – being one of two medallists for Paraguay alongside Víctor Fatecha. Her best performance of the year came at the 2013 Bolivarian Games, where she set a Games record and national record of 5733 points to secure the gold medal.[12]
In her first heptathlon of 2014 she again won a regional gold medal, this time at the 2014 South American Games. Her result of 5669 points was a Games record and she became the first ever Paraguayan woman to win an athletics title at the competition.[18] This included a national record of 13.66 seconds for the 100 m hurdles.[12]