After a stint at The Sun she returned to Sydney and set up her own studio, where she worked alongside Betty Rogers, who had trained with her and also acted as her model.

[6] A review in The News wrote that her illustrations "are by far the best part of the book – these are distinctly clever and original",[7] while the Sydney Mail said she "has a gifted pencil and has caught the humour of the verses with spirit and success".

[9][10] While in England she was employed as an illustrator by Oxford University Press and other publishers, and worked on a number of books by Dorita Fairlie Bruce and Elsie J. Oxenham, among others.

Also onboard the Asturias was author Dale Collins who commissioned Horder to illustrate his book, The Vanishing Boy.

[12][13] Horder illustrated award-winning books by Nan Chauncy, Joan Phipson and Patricia Wrightson.