Her obit indicates Rose died at her daughter's home in Minnesota. Perhaps you can order her death certificate? They are only $9, which is a great price compared to what most states try to rip you off for. see link at bottom.
Newport Daily News
Newport, Rhode Island
Monday, November 13, 1950 - Page 2
Mrs. John M. Anderson, 81,
Dies In St. Paul, Minn. Mrs. Rose Green Anderson, 81, wife of the late John M. Anderson of Jamestown, died Saturday after a brief illness at the home of her daughter, Mrs. Charles Gilbert, in St. Paul Minnesota. Born in England, Mrs. Anderson came to the United States at an early age and settled in Newport where she lived a number of years after her marriage. In 1924 she moved to Jamestown where she remained until going to St. Paul two years ago. Besides her daughter, she leaves five sons, Edwin Anderson of Springfield, Mass., William Anderson of West Medbury, George R. Anderson of Providence, and Malcolm and John Anderson of .Jamestown, 14 grandchildren; and five great grandchildren.
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Newport Daily News
Newport, Rhode Island
Thursday, November 16, 1950 - Page 2
MRS. J. M. ANDERSON RITES ___________
Funeral services for Mrs. Rose Green Anderson, wife of the late John M. Anderson, who died Saturday at the home of her daughter in St. Paul, Minnesota, were held this afternoon at her home on East Shore road, Jamestown. The Rev. Myron Hertel, pastor of the Central Baptist Church, officiated. Bearers were her five sons, Malcolm, John M., William, Edwin and Richmond Anderson, and her grandson, Robert Anderson. Burial was here in the Island cemetery.
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MN Death Certificate Index:
http://people.mnhs.org/finder/dci/1950-MN-027742