Brenda Meredith Seymour

Brenda Meredith Seymour was actually an illustrator, but she's credited with writing for Swift Annual 7 (1960), hence her inclusion here (I'll get around to illustrators eventually, honest). She also illustrated her contribution, a poem entitled 'Pets' and had earlier illustrated poems in two previous annuals (4, 1957, and 6, 1959), which makes me suspect she also wrote the accompanying verses.
A Google search turns up lots of copies of books but nothing in the way of information. Can't find anything in any other obvious resources... a truly mysterious lady.

Update: A relation of Brenda Meredith Seymour has posted a video about her life and career, which you can find here: https://www.facebook.com/johnny.black.9440/videos/3167715216656909

Illustrated Books
First Carols, illus. Brenda Meredith Seymour. London, Lutterworth Press, 1967; New York, H. Z. Walck, 1968.
First Hymns, illus. Brenda Meredith Seymour. London, Lutterworth Press, 1967; New York, H. Z. Walck, 1968.
First Nursery Rhymes, illus. Brenda Meredith Seymour. London, Lutterworth press, 1968; New York, H. Z. Walck, 1969.
First Poems, illus. Brenda Meredith Seymour. London, Lutterworth Press, 1968; New York, H. Z. Walck, 1969.
First ABC, illus. Brenda Meredith Seymour. London, Lutterworth Press, 1969; New York, H. Z. Walck, 1969.
First Counting, illus. Brenda Meredith Seymour. London, Lutterworth Press, 1969; New York, H. Z. Walck, 1969.
My Birthday Book, illus. Brenda Meredith Seymour. London, Lutterworth Press, 1971.
Nursery Songs and Carols, with Frank Waters; illus. Brenda Meredith Seymour. London, Franklin Watts, 1971.

Illustrations
The Golden Trail. An eastern fantasy, by Geoffrey Broughton; illus. Brenda Meredith Seymour. London, Macmillan, 1966.

(* The illustrated page above is from Swift Annual 6 and is © Look and Learn Magazine Ltd.)