It looks like two different people:
Dorothea Johnson, born 1901, daughter of Eben Johnson married Colin Botha, 1919, then married Frank Sydney Spears in 1932.
Dorothea Scott, born 1931, first married Willem Petrus Botha in 1950, then married Clifford Peter Rhonald Edward Murison Johnson in 1960.
I'm going to go ahead and straighten this out.
They're separated into two profiles now:
Dorothea (Johnson) Botha Spears, born 1901
and
Dorothea (Scott) Botha Johnson Pentz, born 1931