Jess, just a suggestion......but maybe a distraction for her.......playing the Bird Sitter dvd while you are out, may change her mood and feel closer to a flock while you are gone. Perhaps she'll scream at them and get it out of her system, or just be happy and content having a flock of her own. Thus welcoming you when you do come home.
Another thought, is she getting enough sleep at night? Perhaps she needs more sleepy time?