This is Excelsior School in Salem, Karen's Grandmother went there as a student then returned and taught there.  Here is the info on her Grandmother-
Oscie Alma Knight   b: 30 June 1895 in Salem, Illinois. m: 30 June 1919 in Methodist Church, Salem, Illinois, Marion County d: 14 August 1973 in Franklin Hospital, Buckner Illinois Father: James Buchanan "Buck" Knight Mother: Aletta "Allie" "Alice" Burns  Burial: 18 August 1973 East Lawn
Cemetery, Salem, Illinois, Line M, section O, lot 18.   Occupation: School teacher