I have viewed the index for Marriages in
Rochester NY. I started with 1914 and went to 1950. The only
Sullivan I saw was
Bridget Sullivan who married John
Shanahan in 1920. I came across many Mary's in my Cem. search. The closest match to your description is Mary
Shanahan buried 4/17/1937 at age 68. Her obit said she died 4/14/1937. She left 5 daughters, 26 grand children and one brother, Charles
Higgins. I could not locate a headstone on her but if she rings a bell I can give you the names of her daughters.
There are a few others with birth years close enough to mention. Mary
Shanahan 1861-1927 She shared a headstone with her husband, Daniel
Shanahan 1857-1939. Another Mary
Shanahan, in Cemetary born 1861-1931 I didn't find her headstone. There are more if you need them. WB