It's a long way from New York to Hawaii - how might he have ended up with Stanley Armour Dunham when he was two or three years old, if his mother died in 1970?
IMO Madelyn told Virginia Goeldner that convenient lie - (IN 1982!) because she didn't want to divulge where he really came from, and who his parents were. All she achieved by that lie was to make it clear her own daughter wasn't the mother.
And by 1963-64 her hair was quite long, there was no need to tamper with the image, here she is sitting on her own, taken on the same day as the image at the zoo:
I just can't make the Bari Shabazz story fit, and now it's a mother from out of no-where...there are too many gaps.