What evidence do have that Elizabeth's parents were from Boston? All of James Francis Munroe's residences that I could find are in Masschusetts. It looks like he never married, because he is listed as single in his censuses from 1900-1930. Otherwise he would be listed as divorced or widowed, right? I think you might have the wrong parents. Here's his info:
Name James Francis Munroe
Birth 13 September 1854 South Boston, Boston, Suffolk, Massachusetts, United States
Death 25 December 1932 Wollaston, Quincy, Norfolk, Massachusetts, United States
Burial 1932 Jamaica Plain, Suffolk, Massachusetts, United States of America
Parents James Watson Munroe, Laurana C. Crane
Residences
1854 Boston, Suffolk, Massachusetts, United States
1855 Ward 12, Boston, Suffolk, Massachusetts, United States
1860 12th Ward Boston, Suffolk, Massachusetts, United States
1865 West Roxbury, Ward 03, Norfolk, Massachusetts
1870 Massachusetts, United States
1880 Waltham, Middlesex, Massachusetts, United States
1900 Precinct 4 Boston city Ward 18, Suffolk, Massachusetts, United States
1910 Boston Ward 20, Suffolk, Massachusetts, United States
1930 Boston (Districts 1-250), Suffolk, Massachusetts, United States
https://www.familysearch.org/tree/person/details/LBX2-7JM
Good luck!
