Baby goats are absolutely (overwhelming) beautiful and cute for a few weeks, then they change into (well, what older goats look like).
Black babies can often have that cross-bred glow on the skin (like a pregnancy bloom), because it is neither black or white.
Deep down in her emotions, your friend at work with her three white kids, may have a yearning that her husband may not be able to fulfil. She may have admired some black children or have a fantasy of BBC from seeing pictures or hearing other women talk about their experiences with dating black men.
Curiosity of what it MIGHT FEEL LIKE to be bred by men other than her husband, can become an itch that grows stronger and stronger over time.
Your work friend has progressed to the point of feeling comfortable to tell others in advance of her decision to have a black child. If no one thinks it is weird, she can go ahead and find a suitable black bull to do the naughty deed. She must have discussed this with her husband and probably her mum and dad (and siblings).
"...she smiled in a weird way...." She most likely has kissed a big black cock already and is making the mental adjustments to (make it true for her) be bred.
She would like a black baby, so she will care for it properly when it arrives.
Society tells women so many negatives about what they are allowed to do and not do. If something is taboo, there will be rule breakers wanting to discover what the fuss is all about.
Most people have broke the speed limit on the road in their cars, so some women will break the rules of not breeding with another race.
Who makes the rules? Certaintly not by democratic process, but by Dictators who control money and people to suit their own needs.
Nothing in the Ten Commandments about not breeding with another race, just "not to fuck your neighbor's wife without first getting his permission, to avoid getting a dagger in your heart. However, when he gives you permission, he might want a few nights in bed with your wife as compensation.
Wife swopping may sound great in theory, but what happens if both wives think it is absolutely marvellous, and they fixate on one husband and reject the other one?
Babies can look cute, but a woman needs MORE THAN CUTE. A man may look cute, also, but can he perform in bed long-term, and still let his wife enjoy her lovers?
A cuckoldress may wish to be bred black - and she knows that her obediently, submissive husband won't raise objections, because she rocks the cradle and rules the roost. She wears the panties, and decides who is allowed to take them off. Her hubby wears panties also, to prove he loves his wife unconditionally.