Mary Marvin married Horace DeCamp and had a daughter Julia Janet DeCamp (later Mrs. Bruce Wisner Winpenny and still later Mrs. Lyman L. DeCamp) and a son Frank G. DeCamp. She lived out her life in Herkimer County, New York where she owned a home at 12 Birch Road in the town of Thendara. She died on October 17, 1975 at St. Luke's Memorial Hospital in New Hartford, New York at the age of 81 and was buried at Riverview Cemetery in Old Forge, New York. I don't know of any other Titanic survivors buried there.
In her will she divided her estate between her children and grandchildren, specifically disinheriting her grandson, Wheaton Kitteredge, Jr., the only son of her daughter Peggy (who was the child of Daniel Warner Marvin). Her entire estate was valued at $38,558.16 and her liabilites amounted to $32,456.67--so there was very little estate to be divided among the heirs. Her descendants now live in New York, Florida, and Vermont.
I hope some of the above is what you were looking for!