In April 2021 Jacoby took second place in the finals of the 100-meter long course breaststroke at the TYR Pro Swim Series swim meet in Mission Viejo, California with a personal record time of 1:06.38. She finished behind 2016 Olympic gold medalist and world record holder in the event, Lilly King, and before 2019 Pan American Games gold medalist in the event Anne Lazor. Jacoby's swim garnered press coverage from NBC Sports who featured her swim as a story highlight of the swim meet heading into the 2020 Olympic Trials in swimming in June 2021. Jacoby's swim was the sixth-fastest time in the world for women in the event so far in the 2021 year. It also catapulted her to the mark of the 14th fastest U.S. female swimmer in the event in history, and third fastest in the event in history for the U.S. females 17-18 age group.