Cora is a long-term user of antipsychotic medication and was once misdiagnosed with a medical condition that mimics tardive dyskinesia. her misdiagnosis was most likely:

Cora might have been diagnosed with another disease that presents similarly as tardive dyskinesia (this disease is a common adverse effect of antipsychotic drugs). Her misdiagnosis is most likely Sydenham's Chorea which affects people with rheumatic fevers. Other differentials include seizures and essential tremors. 

I’m so sorry i don’t know the answer but i really need