In order for us to assist you, we need more info
Is the bird shaking it's head continuously, or at certain times.
Neurological symptoms can be caused by many things. One is metal toxicity poisoning. There are so many different things to look out for
If the bird continues shaking her head, let an Avian vet, who is qualified in this field examine her. If tests need to be done etc, you will get proper advise and treatment.
She does it mostly when we are at work, or when someone she doesnt know well is talking to her, but she does it every once in a while at home. Its like she fluffs up her feathers then shakes her head. Is it maybe just a nervous habit?