This is a little puzzling to me and her being just 6 months old is unusual but has anything changed in her home, any new people, furniture, new clothes or whatever, sometimes a change will make them act differently. If not then maybe it is a time for a checkup by an avian vet, maybe she is feeling poorly.
Is she eating and drinking normally and getting her proper amount of sleep? Maybe some of the more experienced grey members will have some better ideas for I am stumped at the moment.:huh: