In 1961 there were no interstates. In 1961 the jet age was just starting and flights had many legs, shorter legs than we are used to today. Stanley’s trip, if from Kenya to Mercer Island — how long would it take? If from Hawaii — how long? How long to drive to Mercer Island from SeaTac, or from San Francisco? Diapers get changed every 3 hours or so. Who did she travel with?
All there were then was women stews--on BOAC; the stews would have changed all the diapers in the world. The women in his tribe would have taken care of her until she got on the airplane.
I am not willing to admit in public to having driven between Seattle and Vancouver BC in that era but let's just say I have first hand knowledge--freeways were under construction although the drive took a little longer then than it does now; but not much.
But I have good friends who flew between British Africa and the US in the early 60's to take depositions; that is how they went.
If she delivered the kid in Kenya in late July or early August, and she was going back to Honolulu, she would have gone BOAC through Glasgow to Vancouver; local transport, probably ground to Seattle and Mercer Island; then on to Honolulu through San Francisco out of Sea Tac.
I’m going to venture that Vancouver BC is less that 3 hours from Mercer Island...