Oops! Sad to say, she died in Sept. 2012, in Hubbardton, Vermont, aged 76. (Some sources, strangely, claim she died in 2002.) I only found out she'd died when I happened to search on her husband's name, Carson "Kit" Davidson!
Death record:
https://dl-mail.ymail.com/ws/download/mailboxes/@.id==VjN-MrszuisFCtvporZfkOGsTwfnm0fJTtf4FpdP4uBvkryHa9dEFOUEpWcopCvcTsXxUWhjIv2uHVC2R0Wv8Q9VgQ/messages/@.id==AA3DC40IdNKAYIrqYgDqYDeCRyk/content/parts/@.id==2/raw?appid=YMailMini&ymreqid=3589959a-e823-
4b1e-1c53-ab0000017400&token=45Qdtu9SpqYjoCELU-dPnIC-mFt8Ua2EgGPuUG_4L9FIUL0dDT51NAXJUhSDXzpCP6Yl4C4UBzOTNnnTmZxX5MDVKIJCrMn7DX2h6fOaS7OldJA8i3vzfiNePJFcLA02
Yes, her maiden name was Compere. Apparently, when she wrote her biography of Louis Braille in 1971, her sister, Janet Ruth Compere, illustrated it.
This is her father's death notice, from 1973:
https://www.nytimes.com/1973/12/19/archives/tom-compere-editor-on-herald-tribune.html
About her husband:
https://en.m.wikipedia.org/wiki/Carson_Davidson
And this, thankfully, has a picture of Margaret at the bottom - from 2011! (Plus Carson.)
http://homes.ottcommunications.com/~dsonder/beebepond_files/Mount%20Zion%20Trails.pdf
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