She was appointed Ambassador of Turkey to Slovenia succeeding Melek Sina Baydur and serving in Ljubljana between 15 March 2008 and 9 October 2009.[3] Returned home, she became in 2010 Deputy Undersecretary responsible for European Union Affairs in the Ministry, the highest-ranked position held for the first time ever by a female civil servant in Turkey.[4] In 2011, Sezgin was appointed ambassador to Austria succeeding Kadri Ecvet Tezcan.[2] Her next appointment was to Valletta as Ambassador to Malta,[5] where she served until 1 July 2015.[6] On 14 June 2017, she became advisor at the Ministry.[7]