Tom:
I did some research on Lillian Rogers/Dancoff back in 2013-2016, and I can add a little to what you have written above.
I was never able to find a marriage record for Sam Rogers and Lillian Dancoff, although I suspect they were married prior to Sam's enlistment on 16 September 1942.
Following his discharge in 1946, Sam and Lillian's whereabouts are unknown until they first appeared in Dallas City Directory records in 1957, living at 2917 Emmett Street - Lillian had started working for Zapruder's business in 1956, and she appears to have continued working for the company until it ceased trading, given that she listed herself as "retired" for the first time in the Dallas City Directory of 1978.
Sam and Lillian separated around 1962. There were allegedly two sons from their marriage, and Brenda Simmons - Sam's daughter-in-law - was possibly/probably married to one of the two sons.
Following his separation from Lillian, Sam remarried on June 15, 1964, but the marriage ended in divorce in October 1969. Sam died in Dallas on September 17, 1990.
Lillian never remarried, although she continued to live at the address she shared with Sam until at least 1966. From 1970 until her death in September 2005, she lived on Ravinia Drive in Dallas.
Interestingly, from 1970 until 1984, Lillian was listed at that address as Lillian V. Rogers, but from 1985 she was listed in the city directory simply as "L. V. Dancoff".
She was described to me by a family member as "an interesting and mysterious lady", and it appears that she never spoke to anyone about the events surrounding the assassination, or her involvement in them.
I have never been able to find a death record, death notice, or obituary for her in the Dallas media so if you ever find one, perhaps you might let me know, please?
Chris.