Rubuta ci gaba don wannan sakin layi - A ranar 23 ga Maris, 2015, an ba da sanarwar cewa Arnold zai zama Jakadan Birtaniya na gaba a Mongolia a matsayin magajin Christopher Stuart. Ta karbi wannan alƙawari a watan Mayu na shekara ta 2015. A watan Maris na 2018 an maye gurbin ta da Philip Malone. Daga shekarar 2018, ta yi aiki a matsayin shugabar Rukunin Cinikin Dabbobi Ba bisa ka'ida ba a Ofishin Harkokin Waje da na Commonwealth, sannan ta jagoranci nasarar da Burtaniya ta yi na shugabancin taron Majalisar Dinkin Duniya na Canjin Yanayi na 2021.
, COP26.