This is one of the many outstanding ads she produced for Braniff (she even redesigned the planes).
Hardly one by or for the sisterhood, but it works.
The above info comes from London creative Dave Dye’s fascinating blog Stuff from the Loft where Dave (he isn’t that old by the way, Mary is 85) spends some time delving into his archives to unearth such gems, among other interesting stuff.
We warmly recommend Dave Dye’s blog.