Gwilym joined
BBC Wales in the 1980s and produced and directed numerous documentary television programmes over two decades. These included the Welsh-language series
O Flaen dy Lygaid (
Before Your Very Eyes) and the English-language series
Women in Politics. In the late 1980s she produced documentaries about various women in politics, including
Eugenia Charles,
Simone Veil,
Tatyana Zaslavskaya and
Benazir Bhutto. She also worked as a freelance
radio producer and created the radio show ''Beti a'i Phobol
(Beti and Her People''), hosted by
Beti George, for BBC Wales. Gwilym was hired by
S4C, a Welsh-language television channel, in 2004 as the editor for factual programmes and co-productions. Her productions for S4C included ''O'r Galon
(From the Heart
), Wynebau Newydd
(New Faces
), Cefn Gwlad (Countryside
), Ffermio
(Farming
), and nature programmes hosted by Iolo Williams. She was a content editor on the current-affairs programmes Y Byd ar Bedwar (The World on Four
) and Wedi 7 (After 7
). In 2010, she won a BAFTA Cymru award for her on Dwy Wraig Lloyd George
(The Two Wives of Lloyd George''). ==Death==