The Island Packet of Hilton Head reported that 41-year-old Sonia King of Estill is charged with three counts of abuse of a vulnerable adult.
Investigators accuse King of slapping two women and threatening to choke a third during her morning rounds Dec. 31.
A spokeswoman for Brookdale Senior Living says King was fired from its Carolina House center at Hilton Head Island on Jan. 10.
Beaufort County sheriff's deputies say the victims were given medical treatment and none of them suffered life-threatening injuries.
It was not clear if King has an attorney.