Wing Commander Horder joined the RAAF as an Air Traffic Controller in 1979 and spent the early part of her career working in various towers on the East Coast of Australia. Whilst in Thailand on leave without pay in 1988, she was recalled to duty and worked as an assistant to the Defence Attache in the Australian Embassy in Bangkok.
On return to Australia, she took up a posting as a Directing Staff member at the Officer Training School and spent a rewarding eighteen months instructing direct entrants leadership and oral communications whilst studying for her Bachelor of Teaching.
In 1995, as the Protocol Officer at RAAF Base Fairbairn, she changed specialisations and became an administrative officer, specialising in Human Resource Management.
After stints as the Administrative Officer at RAAF Base Fairbairn and 2 Control and Reporting Unit, she was posted to Headquarters Northern Command in Darwin. As the Staff Officer Executive Support during Operation Warden, she was heavily involved in the augmentation of Northern Command to undertake 24hr operations to support operations in East Timor.
Wing Commander Horder assumed the position of Executive Officer /Commanding Officer of HQ 396 Combat Support Wing in March 2001. In May 2002, she attended New Zealand Defence Force Command and Staff College and graduated in December 2002, returning to be Base Commander RAAF Base Darwin. In 2004, as the Senior Operations Officer RAAF Base Williamtown, Wing Commander Horder reviewed the operating agreement between Newcastle airport and RAAF Base Williamtown.
Her current position is Director of the Australian Defence Force Peacekeeping Centre. Wing Commander Horder has had deployments to both Bougainville and Solomon Islands. She also spent time in East Timor during INTERFET.
Wing Commander Horder and her husband John Smith, have four children. Wing Commander Horder enjoys most outdoor pursuits and is a keen student, having just received her Masters in International Management.