Of all the birds I have ever had the pleasure of knowing, I can tell you that our Umbrella's are the most loving and expressive. Screaming is a form of expression for them.
As you know, she will need time to adjust. She is getting attention for the first time in who knows how long, poor thing is starved for affection. I would just give her time and love. I would follow your normal routine with the birds, don't give her too much extra attention (only because you will set yourself up for this becoming a constant behavior).
Has she been to the vet? I would make sure there is nothing physical wrong first. From there, I would find something she loves (toy, tv, music, etc) that can be used to distract her when she starts screaming. Ours can be distracted (they will have "scream wars" sometimes) by my singing lullabyes (I say distraction, hubby says punishment LOL).
I would love to hear her story. One of ours came from a "less than ideal" situation. The other was a very well loved/spoiled baby that needed a new home due to unforseen circumstances. They both have settled in, and we and they have adjusted. It took time, but I couldn't imagine life without them.
Also, I want to say thank you for making this girl's life brighter.
