The people in the Archives area at the Lawrence University library may also be able to help you...They used to keep files of all the faculty and write ups as they could collect... There is a collection:Edna Wiegand Papers, c.1890-1976 | Lawrence University Archives.
Scope and Contents: The Edna Wiegand Collection contains correspondence, newspaper clippings, materials from her travels, photographs of Dr. Wiegand and her immediate family, her Doctorate of Philosophy degree from Columbia University, and her honorary Master of Arts degree from Lawrence University. Wiegand graduated from Lawrence University in 1911, and later taught in the Classics department. When Dr. Wiegand retired in 1952, Lawrence University granted her an honorary Master of Arts degree.
These are not digitalized, but they might hunt and see if the obit is there...I was surprised not to find it in the obituary collection at the Appleton Public Library.... lots of other Wiegands though
there are 2 pictures of her on the digital area of the library's things: