Like you, I have tried lots of combinations of name and surname but not found a death record. I believe the "Northern Ireland" also comes from a family tree entry owned by someone in Arizona and written:
Alice Rachel McDowell - Birth 10 Nov 1824 in Northern Ireland - Death 29 Jan 1883 in Lawrence, MA
Have also come across a couple of other entries with the same death date but giving New York City - but I can't find anything under that either.

Not sure that is correct anyway.
Have read Alica Rachel died of Typhoid Fever and is buried Bellevue Cemetery, Lawrence, MA - Lawrence which is where Ellis died so seems more likely.
https://familysearch.org/pal:/MM9.1.1/N7PT-GQPSandra