I'm not related.
Amanda Girling apparently died in 1901. Newspaper references indicate she received a pension beginning in 1893. Possible points of further research.
I also find substantiated reference to an Amanda Halleck/Hallick/Hallock of appropriate age being married @1850 to Samuel E. Perry. She is referenced in several Montana records for thier children.
You might try contacting the Newburgh town historian. Most early records were kept locally.