So Dora Feldman was a Miss Rolnick and a first cousin to my mother Lily Rollnick of South Africa.
I have researched the Rolnick family in detail for a book that I am writing. I could send you, if you wish, my chapter on the Feldman Rolnicks, and also chapters on her siblings. Just send me your email address and I will attach the pdf or pdf's. Dora is the oldest of the sisters and you can see from the photo which is the oldest. Second from the left.