Dianne Kohler-Barnard will appeal the Democratic Alliance's decision to terminate her membership, she said today.
Kohler-Barnard, a member of parliament, is a vocal critic of South Africa's police ministry.
In September Kohler-Barnard republished a post in which the author criticises police corruption and calls for the return of apartheid-era President PW Botha.
"Please come back PW Botha you were far more honest than any of these ANC rogues, and you provided better services to the public," wrote user Paul Kirk, referring to the ruling African National Congress.
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"PW Botha was a tyrant, who oversaw torture and murder of thousands of South Africans," the Democratic Alliance said in a statement, adding that the party is committed to reversing the legacy of apartheid, South Africa's racist political regime that ended more than two decades ago.
"I apologise unreservedly for sharing a post ... In the midst of which the author praised PW Botha. I erased it immediately when I realised," Kohler-Barnard tweeted on October 1. She added that she often shares this user's posts because of his criticism of police corruption.
Botha, who died in 2006, led South Africa for more than a decade under the racist apartheid regime.