She has profiles on FamilySearch, and Ancestry.
1877 birth: She was born in Vilnius on 1 Feb 1876 in the Julian calendar, which I believe is 13 Feb 1877 in the Gregorian calendar now used.
As recalled by her granddaughter Martha, and supported by the records on LitvakSIG, Yetta's mother passed away in birthing Yetta, and Yetta's father then married Yetta's mother's sister.
Maiden name?: There are four records of her on LitvakSIG. On all four, her surname transliterated from Russian into English is Anshprun. Her maiden name is recorded various ways in the American records:
1901 marriage: She married Meyer Isaac Plen in Vilnius on 23 Apr 1901 in the Julian calendar, which I believe is 6 May 1901 in the Gregorian calendar.
1956 death: I do not know when she died. I am confident it was after 1952, and likely before 1958. (Her granddaughter Martha recalls that when Yetta was sick she stayed at a house that Martha's family moved to after Martha turned 13. Martha was born in 1939. Thus I conclude that Yetta was still alive in 1952. Martha recalls that Yetta did not come to Martha's wedding, at her age 19. So it seems likely that Yetta passed before 1958.)
Update: Beth David says she is buried in the Friedman plot, and died 1956. She appears in the NYC death index under the name "Yetta Plak". It says she died 27 Apr 1956 in Brooklyn.
Sec 4, Blk 0, Plot 2495, Row LWR, Grave RT#8. Plot owner Herman M Friedman. Beth David Cemetery, Elmont, NY.
Her granddaughter Roz recalls that Yetta had Parkinson's disease.
There are four records of her on LitvakSIG:
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Yetta is 27 degrees from Emeril Lagasse, 30 degrees from Nigella Lawson, 31 degrees from Maggie Beer, 52 degrees from Mary Hunnings, 35 degrees from Joop Braakhekke, 34 degrees from Michael Chow, 30 degrees from Ree Drummond, 31 degrees from Paul Hollywood, 29 degrees from Matty Matheson, 29 degrees from Martha Stewart, 38 degrees from Danny Trejo and 34 degrees from Molly Yeh on our single family tree. Login to find your connection.