Anonymously, a miniature scroll has been left atop her papers one morning. It's sealed quite dramatically in red wax. Unrolling it reveals it to be an incantation of protection for use by those in unavoidably frequent contact with mages. It's drawn over extensively in nonsense sigils, and instructs the reader to recite it every night, to ensure that they don't catch magic.

(It was probably funnier before the wing thing.)