So if I say this all back, your Mom, Gail, was the daughter of Gladys Wolfe. It is possible that Gladys is the daughter of Frank Ellis Jr. and Ellen/Nellie Smith. It appears that Gladys may have been raised by her Grandparents, Frank Sr and Annie (Smith).
I think you are looking for 2 things... an obit for Annie, and from that you might learn more about Gladys.
From the 1931 New Bedford Directory:
Ellis Anna T wid Frank E died April 2 1930
I suspect Frank died about 1926/27. They appear together in the 1925 directory. They are both missing in the 1926 book. Annie re-appears in 1927 at the 1925 address with an occupation of cook. (Her name in the directories varied from Anna to Annie, with middle init of Y or T.) While someone might be able to find an obit for Annie, it may not offer much.
What is the significance of the 1952 date? And is it possible that the "Aunt" Annie may have been a sister of her mother Ellen/Nellie? It clearly wasn't Annie Ellis, since she died before your mom was born. It's also quite possible that it wasn't an aunt at all. I know I had several "aunts" when growing up.