In 1999, Creagh became the second-in-command of the 1st Joint Support Unit and commanded the 145th Signal Squadron in East Timor as part of the International Force East Timor (INTERFET). She served in Iraq in 2006 and with the headquarters of the International Security Assistance Force (ISAF) in Afghanistan for nine months in 2008 and 2009, for which she was awarded the NATO Meritorious Service Medal.[2][4] She was the Director-General of Public Affairs in 2010, the Director-General, Strategic Communication, from 2011 to 2013, and the Director-General, Australian Defence Force (ADF) Theatre Project, from 2013 to 2014.[3] She retired from the Australian Regular Army with the rank of brigadier in 2015, and became a reservist once more.[2][5]
Creagh became a non-executive director and chair of the board of governors of The Road Home, Veterans' organisation, in 2014. She was a council member of the Australian War Memorial from 2015 to 2018, and the executive director of the Spirit of Anzac Centenary Experience in 2015. She was vice-chair of the Australian Peacekeeping Memorial Project from 2016 to 2019, which resulted in the creation of the Australian Peacekeeping Memorial on Anzac Parade, Canberra, which was inaugurated in 2017. She was chair of the ACT Ministerial Advisory Committee for Veterans and their Families and was a Defence Ambassador for the ACT Government. She was a strategic adviser at the Defence Research Institute at the University of New South Wales in Canberra from 2018 to 2019, and has been an adjunct lecturer there since 2017.[2][3]