Heading into the 2018–19 curling season, Tirinzoni joined forces with Alina Pätz, who threw fourth rocks with Tirinzoni skipping at the third position, with Esther Neuenschwander at second and Melanie Barbezat throwing lead rocks. The team reached the final in the first Grand Slam of the season, the Elite 10. They represented Switzerland at the 2018 European Curling Championships claiming the silver medal, going on an unbeaten 9–0 run to finish top of the Round Robin, before defeating Germany 6–4 in the semi-final, and falling 5–4 to Sweden's Anna Hasselborg in the final. Having won the 2019 Swiss National Championships, the team represented Switzerland at the 2019 World Women's Curling Championship in Silkeborg, Denmark. The team got off to a shaky start posting a 2–3 record in their first five games before winning six in a row to secure their playoff spot, and, after a final round dead rubber loss, a round robin record of 8–4 and 4th place in the standings. Tight victories over China in the qualification game, and South Korea in the semifinal set up a repeat of the European Championship final against Hasselborg and Sweden. They were able to turn the tables on Sweden, with Pätz making a draw to the four-foot in the extra end for an 8–7 win which meant they were crowned the 2019 world champions. The team capped off their year with their first Grand Slam title together at the Champions Cup, and reaching the final of the inaugural Curling World Cup.