Rest in peace Marcia. I don't usually watch the episodes in English, but I doubt your work was any bad, considering you stayed for over 20 years.
About The Simpsons, can't they simply replace the dubber? At least in Brazil we don't cut off the episodes that have a specific character if their dubber won't voice them: to be fair, Homer, Marge and Lisa had three different voices here so far, while Bart had two.
Edna is a rather important character, even more now that she's been going out with Ned (or they were sometime, not sure, I haven't been following the lastest two-or-so seasons) (also that's ironic how they killed Maude exactly because her dubber Maggie Roswell left Fox for a few years). Cut her off at this point would be pretty bad.