Who remembers Ursula Lewkowitz?

My mother Ursula Lewkowitz was born in 1919 in Posen and lived in Berlin until she emigrated to England in June 1939. She went to Margaretenschule (Ifflandstrasse), the Waldschule Grunewald of Toni Lessler and finally to the school at Grosse Hamburger Straße. Her parents had several shoestores and were rather wealthy. After her father Simon died in 1933, Ursula (Ulla) and her mother lived on Ku’damm. Her older brother Max Rudi escaped to Spain, her mother Sara was deported and perished in the Holocaust. Any details on her or her family would be greatly appreciated (can be in German, English, Hebrew, whatever).

—
Yiphtach Ronen (Peter Lewkowitz)
Chiffre 209309