You're right, that was my error. Came from my search for Manzano in a collection of scripts. The Manzano query refers not to Sonia as the writer but the character "Mrs. Manzano" referenced in the script.
I have another question. Shouldn't we have episode writing credits for Jeff Moss, Cathi Rosenberg-Turow, Nancy Sans, Tony Geiss, Jocelyn Stevenson, David Korr, Emily Perl Kingsley, Judy Freudberg, Tom Dunsmuir, Ray Sipherd, Molly Boylan, Lou Berger, Christine Ferraro, Norman Stiles, Joey Mazzarino, Mo Willems, and Jon Stone?