I could not find any widely known, reliably attributed quotes by Carolyn Warner (the American educator and former Arizona Superintendent of Public Instruction).

This is a meta-statement indicating that the speaker (or writer) was unable to locate any well-known quotations that can be reliably attributed to Carolyn Warner.

It conveys uncertainty or a gap in documentation rather than presenting a substantive viewpoint from the author; it functions as a note about attribution and availability of sources.