I haven't found direct evidence of her possible Jewish roots, but I discovered she is on the Advisory Board of the European Holocaust Research Infrastructure (EHRI).
https://www.ehri-project.eu/ehri-advisory-board/
I assume Africans and Arabs would be considered not homogeneous too, so I'm sure it will be perfectly okay for us to refer to them as mongrels, right?
Apparently her South African father is Jewish.