They will not be effective in teaching her not to demand more attention of you by screaming. The best way to stop a bird from screaming is to figure out why they are screaming and to work with the underlying cause of the screaming rather than the screaming itself. Parrots are highly social animals who are in constant communication with the members of their flock. Most companion parrots will make sociable contact calls to their flock before they start screaming. The worst thing you can do with a screaming parrot is to give it attention when it is screaming.
Parrots are naturally verbal animals.
It is only when they scream to manipulate us that their screaming becomes a problem. As long as your Greenwing is rewarded for screaming, she will continue to scream. The bird is happy, healthy, chirpy, and friendly, but it does have one weird habit. It bangs on the wooden bookcase like a woodpecker. Not all the time, just occasionally.