Near the beginning of the Kingston Trio recording of It Takes a Worried Man, someone says, "This is for Shirley."

I've wondered about this for years. I have a vague recollection of once reading that Shirley may have been a songwriter, arranger, or someone associated with the recording session, but I can no longer find that reference and may be remembering it incorrectly.

Does anyone know who Shirley was, or have a source (liner notes, interview, session notes, etc.) that explains the dedication?