I don't think the Wave was around at that time. However, there were a number of papers in Aurora county over the years. A list and information can be found here:
http://chroniclingamerica.loc.gov/titles/place/south_dakota/...

Some of these are available on microfilm at the SD Archives and are available for research (but only on microfilm). http://www.sdhistory.org/arc/arcgen.htm

You might want to browse the Archives site to see what on-site research help might be available.

About Sadie Wagner...

p. 155
SADIE VIOLA WAGNER
by Louisa Loevinger and Nancy Sorensen
Sadie V. Wagner was born in Lyon County, IA in 1877 to John A. and Nancy Jane (Harkness) Wagner. In 1891 she and her family came by train to Aurora county... She taught in rural and White Lake schools until her marriage to Ludwig Loevinger in 1897.... Mrs. Loevinger passed away in 1954.

p. 121 FRANK ROBERTS LOEVINGER
... He was the son of Ludwig and Sadie (Wagner) Loevinger and was born in 1898 at White Lake.

p. 68
Note: The following program of an evening of entertainment at White Lake School was saved in a scrapbook.... because of the length of the program it was not completed in one evening, but had to be continued the following evening.
WHITE LAKE SCHOOL LIBRARY ENTERTAINMENT
Saturday, March 27, 1897
1. "America"
...
46. Song -- Miss Sadie Wagner
...
49. Tableaux