In 1931, Leyel edited
Maud Grieve's
A Modern Herbal in two volumes. She herself wrote a long series of works on herbs, including
Herbal Delights (1937),
Compassionate Herbs (1946),
Elixirs of Life (1948),
Hearts-Ease (1949),
Green Medicine (1952), and
Cinquefoil (1957), as well as others on cooking including
Picnics for Motorists (1936).
Picnic for Motorists (1936) evokes, according to food historian
Polly Russell, 'the romance of empty roads, endless summers and carefully packed hampers' Walter Levy claims that "despite its title
Picnic for Motorists is often unpicknicky", that is, unsuitable for an excursion or outdoor eating. The book lists 60 picnic menus, the first of which "suggests melon, cold chicken pie, ham and pea salad, chocolate mousse and cream cheese and crescent rolls". Leyel is said by Russell to have "eclectic" tastes as the book has recipes for "Indian pie with rice, German pie and Chinese orange salad". ==Honors and retirement==