Hi Michael,
Welcome to the Forum.
As this post is over six years old, you may not get an answer. However, we would be delighted to have a history of your grandmother's working life. If you would be so kind as to start a new topic here:
viewforum.php?f=38Anything you have, photos, details of marks, examples of her work, anything, would be great. We look forward to hearing from you.
Regards Trev.