▁trouble ▁is ▁that ▁they ▁don ' t ▁quite ▁know ▁each ▁other ▁as ▁well ▁as ▁they ▁think ▁they ▁do . ▁That ▁will ▁catch ▁them ▁out ▁after ▁Christmas ." ▁ ▁On ▁ 2 0 ▁March ▁ 2 0 1 6 , ▁Reg an ▁announced ▁via ▁her ▁social ▁media ▁that ▁she ▁was ▁leaving ▁Do ctors ▁after ▁two ▁years ▁in ▁the ▁role . ▁She ▁explained ▁that ▁it ▁was ▁her ▁decision ▁to ▁leave ▁and ▁pra ised ▁the ▁writers ▁for ▁her ▁character ' s ▁exit ▁story line . ▁Her ▁final ▁scenes ▁a ired ▁on ▁ 1 ▁April . ▁The ▁story line ▁sees ▁N iam h ▁helping ▁her ▁love ▁interest ▁Ben ▁O w ens ▁( James ▁D af fern ) ▁take ▁his ▁crit ically ▁ill ▁son ▁Harry ▁O w ens ▁( C uch ul ain n ▁C anning ) ▁to ▁Switzerland ▁for ▁surg ery . ▁Upon ▁her ▁return , ▁practice ▁manager ▁Anthony ▁H ark er ▁( Ad am ▁Ast ill ) ▁fires ▁her ▁and ▁N iam h ▁dec ides ▁to ▁move ▁back ▁to ▁Ireland , ▁following ▁" a ▁final ▁fare well " ▁with ▁Al . ▁ ▁Story lines ▁Her ▁early ▁story lines ▁include ▁moving ▁in ▁with ▁Emma ▁Re id ▁( D ido ▁Mil es ) ▁and ▁A yes ha ▁Lee ▁( La ura ▁Roll ins ), ▁and ▁dealing ▁with ▁the ▁fact ▁that ▁she ▁couldn ' t ▁save ▁a ▁patient ▁dying . ▁N iam h ' s ▁final ▁story line ▁was ▁il leg ally ▁sm ugg ling ▁her ▁lo ver ' s ▁son ▁to ▁Switzerland ▁for ▁life - s aving ▁treatment