Washington Spirit Heilferty, a fan of the
Washington Spirit as a child, trained with the team during the
COVID-19 pandemic in 2020. The Spirit selected her with the 19th-overall pick in the
2021 NWSL Draft. Heilferty made her professional debut on April 10, 2021, in the
2021 NWSL Challenge Cup. The team played her in multiple positions, including on both wings, at left back, and as a midfielder. She played 47 minutes as a substitute for
Tara McKeown in the
2021 NWSL Championship match against the
Chicago Red Stars, which the Spirit won 2–1. On January 17, 2023, the Spirit extended Heilferty's contract through 2024 with an option for an additional year. The team also officially converted her to a defender. On February 25, 2023, the Spirit announced that Heilferty would miss the
2023 season due to an
anterior cruciate ligament injury suffered during preseason. Heilferty made her return to the pitch on March 23, 2024, in the Spirit's 2024 home opener match against
Bay FC. In her second match back from injury, Heilferty suffered a season-ending
ACL tear on April 26. It would be Heilferty's second ACL injury in just over a year. At the end of the season, Heilferty's option was declined and she was rendered a free agent.
Houston Dash On September 12, 2025, Heilferty signed with the
Houston Dash through the end of the
2025 NWSL season. She made her Dash debut on September 19, coming on as an 80th-minute substitute in a match against
Chicago Stars FC. Six minutes after entering the match, Heilferty earned a
penalty kick after forcing a
handball from an opposing defender; the ensuing attempt by Dash teammate
Yazmeen Ryan was saved by
Alyssa Naeher and the match ended 1–0 in Houston's favor.
Tampa Bay Sun In April 2026,
USL Super League club
Tampa Bay Sun FC signed Heilferty as a free agent. == International career ==