The union Unison said she was suspended for speaking out against job cuts and government policies. The NHS trust has said it is a private employment matter. About 700 workers staged a similar three-day strike last month.
The workers, who are mostly nurses, will be on strike from Monday until Wednesday. The strike covers all in patient, hospital and community psychiatric services across Manchester.
Workers will be picketing outside North Manchester General Hospital, Manchester Royal Infirmary, and Wythenshawe Hospital.