Source: David Brewster's tree, which he drew based on information given to him by his father.
Christian name from her daughter's death cert in Philly.
DB: I found the Elizabeth Henry on Ancestry, born in Aghadowey, Co. Derry in 1813, and died in Philadelphia, 1891. Sounds like a good match!
BB: Elizabeth Henry Brewster did remarry after John Brewster died as per the personal history tree on Ancestry. See below. Mary Jane was married to a John Orr, also.
Source: Philadelphia Inquirer. January 11, 1891
On the 8th Inst., Elizabeth Parker, wife of the late Thomas Parker, and daughter of Alexander and Mary Henry born in the Parish of Aughadoay, County Derry Ireland, age 78. The relatives and friends of the family are respectfully invited to attend the funeral from her daughter's residence, Mrs. Mary J. Orr at 1348 Point Breeze Avenue Sunday at One o'clock. To proceed to Fernwood
New York Passenger Lists, 1820-1957
Name:Elizabeth Brewster
Arrival Date:22 Mar 1852
Birth Year:abt 1818
Age:34
Gender:Female
Ethnicity/Race-
/Nationality:Irish
Place of Origin:Ireland
Port of Departure:Liverpool, England
Destination:United States of America
Port of Arrival:New York
Port Arrival State:New York
Port Arrival Country:United States
Ship Name:Niagara