I believe this is Amanda's death information from the RI Cemetery Database:
PARKER AMANDA V 1812 - 4 SEP 1901 PW001 (Mineral Springs Cemetery)
It seems that Amanda must have left her first husband Allen in NY State and returned to her home state, where she remarried to Thomas W. Parker and had a son with him (this needs more research to confirm the particulars).
In the Federal Census of 1850, she is Amanda V. Wightman 33 RI, living with Allen and family at Bolivar, Allegany Co., NY.
In the Federal Census of 1880, she appears to be Amanda Parker 59 RI, wife of Thomas W. Parker 48 CT, living at Lincoln, Providence Co., RI.
In the Federal Census of 1900, she is Amanda Parker 88 MA, mother, living with son Samuel Wightman and family at Pawtucket, Providence Co., RI.
The cemetery data shows that she died the following year.