There were two professors named "Miss Stevens" at the time this postcard was written, both of whom lived on Morgan Road according to the 1914-15 MHC directory:
Clara Frances Stevens 1881
PhM 1894 University of Michigan Ann Arbor MI
student Concord School of Philosophy, Harvard Summer School
Phi Beta Kappa
teacher (English) 1881-1904 Mount Holyoke Seminary and College
professor (English) 1904-1921 Mount Holyoke College
professor emeritus (English) 1921-?? Mount Holyoke College
died 1934 in South Hadley
Alice Porter Stevens 1886
Address in 1937: 27 Silver St South Hadley MA
BA 1893 MHC
MA 1904 Radcliffe College
special course grad in German 1886
student 1897-1898 University of Zurich
student 1898 University of Berlin
University of Marburg Germany '86 Fellow 1903-1904
Phi Beta Kappa
teacher 1886-1888 West Chester PA
teacher 1889-1891 Salt Lake City UT
instructor and assistant professor (German) 1891-1904 MHC
associate professor (German) 1904-1929 Mount Holyoke College
professor emeritus (German) 1929-?? Mount Holyoke College
Source
All information from One Hundred Year Biographical Directory of Mount Holyoke College 1837-1937, Bulletin Series 30, no. 5; published and compiled by the Alumnae Association of Mount Holyoke College, South Hadley, Massachusetts