GC never used the word screaming and BB hasn't talked to anyone except the police and police reported that whoever knocked on her door was gone by the time she answered it. Verone wasn't there and anything he was paid to say on a glorified advertisement is suspect.
While your post was not directed to me...
Ya know, I suppose she could have been whispering "Help me"
"Gus Coletti was shaving when he heard a bang on the door of his house on a barrier island in New York.
"Help me! Help me!" a woman pleaded when he opened the door, shaving cream still on his face"
http://www.cnn.com/2011/CRIME/04/14/new.york.serial.killing.witness/
But here... is a QUOTE
“She knocked on my door screaming, ‘Help me! Help me!’” says Coletti, looking into the distance. “She wasn’t making any sense, she was totally spaced out.”
http://archive.longislandpress.com/2011/04/14/long-island-serial-killer-beach-bodies/3/