[2] In 2014, Penitani, along with Brooke Anderson, captained Australia to the Gold medal at the 2014 Summer Youth Olympics, held in China.

The tournament was Penitani's first in 14 months, following a serious knee injury sustained at the 2013 Rugby World Cup Sevens.

[10] In Round 1 of the 2019 NRL Women's season, Penitani made her debut for the Dragons in a 4–14 loss to the Brisbane Broncos.

[12] In October 2019, she represented Australia at the 2019 Rugby League World Cup 9s, scoring five tries and finishing as the tournament's top try scorer.

[14] Tiana was signed with the NRWL Cronulla Sharks inaugural team for 2023 and is the captain of the side