These were exactly my thoughts as I read that propaganda.
I don't doubt that Sr Teresa Benedicta was a true convert from the atheism that she had adopted, that she became a truly holy woman, that she died in Auschwitz during the time of the nαzιs, but what evidence do we have that she died in the gas chambers except that the Vatican accepted that story? This is a serious question.
I couldn't find anything on Google when I searched for Jєωιѕн convert saints. There must be someone other than Edith Stein.