During her time as an Assembly Member for the National Assembly for Wales (1999 to 2016), Jocelyn served on many committees including the Public Accounts Committee and its predecessor Audit Committee.
Yn ystod ei chyfnod yn Aelod o Gynulliad Cenedlaethol Cymru (1999 i 2016), bu Jocelyn yn aelod o sawl pwyllgor, gan gynnwys y Pwyllgor Cyfrifon Cyhoeddus a'i ragflaenydd, y Pwyllgor Archwilio.