Did someone else diaper him when she was traveling? Wife number 1 make the trip and stay with SR while SAD did her thing.
I suspect she was on the run home from Africa after finding out her “husband” was a bigamist, her “marraige” a lie, and his African clan (unlike her black marxist cohorts in the US people’s powe rmovement) would never accept her as a wife or daughter
If you work it right, you can get flight attenedants to help with a baby .... or let the kid marinate in a feces filled diaper for 10 hours or more
Being avery young teen-age mom, I think that she would be happy to let anyone change the dirty diaper if they were willing to. I don’t think it had anything to do with her knowledge of how to do it. She was an only child and probably not all that used to cleaning up and doing stuff for herself. So she let her friend play Mommy with her baby because it was convenient to her.