We no absolutely nothing about Muriel L. Sheppard, although it is likely she lived in Vancouver. There was a student, Edith Muriel Sheppard, living at Roseberry and 25th in North Vancouver with her parents (Mr. & Mrs. William H. Sheppard) in 1940, but that is the closest I have come.

Sheppard, Muriel L. “Silver and Jade.” Vancouver Sun (3 July 1943): 2.