I'm always a bit surprised that more teachers haven't heard of Miss A. It's one of those things that keeps me going when times get rough. If you haven't, you should read this speech [pdf] by Dan Fallon for the overview. Read it again whenever you start feeling like what you do doesn't matter.
Ben was good enough to send me the original 1978 Harvard Education Review article. The lead author was a former student of hers and also wrote this response to a newspaper letter after she passed away.
(Miss A's real name was Iole Appugliese—Miss Apple Daisy to her students. There's a little more biographical information in A Tribute to the Great Montrealers.)
PS - If any of your libraries happen to have a copy of a Canadian Reader's Digest from September 1976 there's an article called Miss Apple Daisy about her that I haven't read. I'd ask you to send it to me but that would likely require you to pilfer some microfiche.