She continued to act after leaving the programme in programmes such as Doctor in Charge, Doctor in the House and the play Cat in the Bag with Alan Rothwell. In the 1990s she had regular roles in two popular comedies, Father Ted, and The Royle Family.
In The Royle Family she appeared alongside former Coronation Street actor Geoffrey Hughes, and future Coronation Street actors Andrew Whyment and Sally Lindsay. Sally learnt that she had been cast in Coronation Street whilst filming The Royle Family and Doreen presented her with a photograph of the original cast signed "From the first barmaid to the newest".
Doreen trained at the Abbey Theatre School in Ireland and worked at the Gate Theatre, building a successful career in classical plays.