Also, Simova discovered the truth about the wartime atrocities almost immediately afterward, including her own parents' deaths in Auschwitz.
Discovering her parents death was a huge shock to Simova. 
mnli hypothesis: Discovering her parents death was a huge shock to Simova.  premise: Also, Simova discovered the truth about the wartime atrocities almost immediately afterward, including her own parents' deaths in Auschwitz.