Laura Voigt, Hannah's daughter, asked me to share this sad news with you.  Hannah was loved by so many and she especially loved CAMTA.  In 2021 she was awarded ISMTA Teacher of the Year.  Here is her bio as it appeared in the 2021 ISMTA conference booklet:

Hannah Voigt, keyboard collaborator, vocal coach, and organist teaches piano in River Forest, Illinois.  She holds a B.S. from Crane and an M.M. from Eastman, subsequently serving on the faculties of both schools upon graduation.  She also spent a summer in France studying with Nadia Boulanger, and Robert and Jean Casadesus.  In Chicago after 1963, Hannah joined the CSO Chorus where she was selected by Margaret Hillis to teach theory to her singers.  At piano pedagogy workshops fellow teachers introduced her to Chicago Area Music Teachers Association, its monthly programs, and its "Syllabus" examinations. She has been a promoter of Syllabus ever since, not only serving for decades as its coordinator for CAMTA but contributing to the replacement of the old "Syllabus" curriculum with the new "Achievement in Music" program.  She created many of the harmonizations in the current curriculum.  Most of her students are graduates of the AIM program.