In 1981, "Eryr Pengwern" ("'The eagle of Pengwern"'), set in 7th-century Powys and based on the Heledd Saga, was written by Jones in response to Gwynfor Evans' threat to launch a hunger strike for a Welsh television channel. Four years later, she moved to journal form with the novel in "Dyddiadur Mari Gwyn" ("Mari Gwyn’s Diary") dealing with the persecution of Catholics in Elizabeth I's reign and focusing on the Elizabethan Welsh writer Robert Gwyn. This was followed by Jones authoring a trilogy of novels between 1987 and 1993 which were set in the Age of the Princes: "Cribau Eryri" ("The Ridges of Snowdonia"), "Barrug y Bore" ("Morning Frost") and "Adar Drycin" ("Storm Birds"). She was inspired to write the trilogy after the failed 1979 Welsh devolution referendum, and an increase of demographic pressure in the Welsh language central areas. Jones' final novel "Cydio Mewn Cwilsyn (Taking up a Quill"), a factious diary of Edmund Prys' daughter, was published in 2002. She wrote ten novels over her lifetime and published a collection of original children's nursery rhymes.