In the mid-1950s Florence was the Cape provincial organiser of the ANC Womenâ??s League and vice-president of the Federation of South African Women (FEDSAW). She was among the original 156 defendants in the Treason Trial, but charges against her were withdrawn in December 1957. She was banned and restricted to Port Elizabeth in 1962 and she was subsequently given a five-year sentence for furthering the aims of the banned ANC. While she was in prison, her health deteriorated badly, as she was sometimes deprived of much needed medical attention, such as the insulin injections. In 1965, her husband died, the prison authorities kept this information from her until her release in 1968. After her release, Florence was banned again, and she died in 1969, while under those banning orders.