I can kind of understand what the author is talking about. She and her best friend had their own thing - they were two of a kind, it was love but not romance, they'd do absolutely anything for each other. Then the best friend had to have a loaf and it killed the best friend the author once knew, leaving behind a shell of a former friend who was only going to worship at the altar of baby from then on. I'd feel hurt, sad, angry and resentful if someone I was really close to had a loaf. It's because I know that friendship would be, at best, vastly different... and, at worst, totally over. Breeding brings out the worst in people, literally and figuratively, and it can be difficult to not hate the brat for taking your friend away from you. Losing a friend for any reason is painful, and if the reason happens to be another person, it's even worse.
It does sound a little bit like the author is throwing a tantrum, but I get why. This is just total unrefined, raw emotion. The author realizes how nuts she sounds, but she can't help how she feels. Seems like the people who take the most issue with the article are Moos, but some readers who state their childfreedom can relate. Most, if not all people who don't have kids will mourn the loss of their friends to breeding at least once. Will this lady still have her best friend? In body, maybe. Will she have the best friend she had before? No. No, that person is gone forever because breeding changes people, and almost never for the better. Post-spawn, breeders only give a fuck about you if they need something from you like money or free babysitting.
Doesn't surprise me that the Moo peers all tell her to grow up, because obviously spawning has made them all worldly and mature. Moos don't know how this kind of heartbreak feels because their spawning is what kills friendships. It's never the killers who feel bad - it's the victims. This is why, as much as it hurts, it's for the best to sever that dangling limb of a friendship when someone breeds rather than leave it hanging to keep making you miserable.
I do think the author became way too dependent on her best friend as her source of happiness, though. Part of me wonders if the author has secretly written fantasy stories about her best friend abandoning her loaf and husband to ride off into the sunset with her so they could be together forever without interference from kids and men.