Author Jack Challem, who was kind enough to share his photo of Lizzie’s grave, has also been gracious enough to mail me an article he co-wrote for The Journal of Pre-Raphaelite Studies in 1987. This is an analysis of the handwriting of both Elizabeth Siddal and her husband, Dante Gabriel Rossetti. Thank you Jack.
It is in a pdf file and studies the personalities of Siddal and Rossetti through their handwriting. It includes the methods they used, emotional make-up of Rossetti and Siddal, thinking processes, potential for achievement, sources of anxiety, social conduct, personal integrity, special aptitudes, etc.
(you will need Adobe Acrobat Reader and depending on the speed of your connection and your computer, the article may take a while to load.)