On the 1895 Marriage Record of her daughter Rebecca, no Birth Surname given, she is just Dora
On the 1902 Marriage Record of he daughter Bessie, her Birth Surname is Dora Freedman
On the 1914 Marriage Record of her son Harry, her Birth Surname is Dora Malah
In the 1921 Death Record for Dora Finn, that Dora's Birth Surname is Feinsinger
-- her father is Morris Feinsinger and her Mother is Ida (with dashes indicating her birth surname unknown)
(Record here: https://www.familysearch.org/ark:/61903/1:1:6P6R-8K3W )