Eoghan Rua retained the Derry Senior Camogie Championship title in 2014 and Mullan scored 1–4 in the final win over Slaughtneil.

In 2017 UCD completed a treble when they also won the EY Champions Trophy after defeating Hermes-Monkstown in a penalty shoot-out.

[15][16][29][30] In March 2015 Mullan was a member of the Ireland team that won a 2014–15 Women's FIH Hockey World League Round 2 tournament hosted in Dublin, defeating Canada in the final after a penalty shoot-out.

[31][32] She was also a member of the Ireland team that won the 2015 Women's EuroHockey Championship II, scoring in the final as they defeated the Czech Republic 5–0.

[33] In January 2017 she was also a member of the Ireland team that won a 2016–17 Women's FIH Hockey World League Round 2 tournament in Kuala Lumpur.

[15][16][35][36][37] She remained captain throughout Ireland's 2018 Women's Hockey World Cup campaign, leading them to the silver medal.