This has bugged me for 25 years.

I used to know a woman, a German immigrant to the US, who worked in the headquarters of the German Army in World War 2. I recall that she worked in a clerical capacity of some type. I do not know if she worked in OKH or OKW headquarters. She married a US officer after the war, which is how she got to the US, so she must have been relatively young during the war. This woman insisted that, when she worked there, she had no idea that the Holocaust was happening. By “Holocaust,” she meant the systemic murders in concentration camps. We never talked about the death squads. At the time, I found that implausible. I still do. I moved away, she died, and I’ve often wondered since then how likely it was that she was telling the truth.

So...how likely is it that she was telling the truth?