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It is unclear if struggle stalwart Winnie Madikizela-Mandela will be discharged from hospital on Friday, her spokesperson Victor Dlamini told News24 on Friday morning.
Madikizela-Mandela was admitted to the Milpark Hospital in Johannesburg on Wednesday. Dlamini said he visited her on Thursday night.
"She was fine, she was well. I will see her this morning to give a more detailed update."
Madikizela-Mandela was at the hospital for a routine check when her doctors recommended that she stay overnight for observation, he said.
Dlamini was unable to provide any additional information.
Madikizela-Mandela was admitted to the hospital briefly in December for observation.
In April last year, she was in hospital after undergoing back surgery.