Vital records in New York prior to 1880 were originated & filed in the Town Clerk's office. You have to know the town she was born in to find her birth record.
I didn't find her marriage record.
Texas wasn't recording deaths in 1884. she might have had a probate record. The Montgomery County records are on microfilm at the Sam Houston State University, www.tal.texas.gov/arc/local/montgomery.html
You also might find that record at FamilySEarch, Catalog. Those records aren't indexed but you can look through the digitized microfilm.
I'd contact the East Montgomery County Historical Soceity, www.facebook.com/
and ask if they have a local death index, indexed newspaper death records and cemetery inventories.
Another resource is the Montgomery County Genealogical & Historical Society, www.mcgandhs.com/
Married: 30 Oct 1873, Dallas, DAllas, TX
Died: 19 Feb 1884, Montague Co. TX
Source: Scroggs Family Tree but no sources
I'd check out these clues if you don't find her in Montgomery Co.