Kammala jumla mai zuwa: An haifi Mamlok a matsayin Ursula Meyer a Berlin, Jamus, a cikin dangin Yahudawa, kuma ya yi karatun piano da hadawa tare da Farfesa Gustav Ernest da Emily Weissgerber har sai iyalinta suka gudu daga Nazi Jamus bayan da
a cikin dukan ƙasar pogrom a 1938. Saboda ƙididdigar baƙi na Amurka, dangin sun koma Guayaquil, Ecuador. Ursula ta yi ƙaura zuwa New York City a 1940 don halartar Mannes School of Music, wanda ya ba ta cikakken tallafin karatu bisa ɗayan waƙoƙin ta. Iyayenta suka bi ta a shekara ta 1941. Ta zama 'yar Amurka a shekarar 1945.