Assuming she isn't just making this shit up to sound more autistic:
If she has no memory of why people suddenly dislike her enough to block her, it is because she is completely empathy-deficient, and therefore others' intense emotions don't affect her enough for her to retain awareness of them. This is something you would see in a person with Antisocial Personality Disorder (colloquially called a psychopath).
If you're a human who is capable of empathy, you will easily remember how another person strongly disagreed with you, and was upset by it, because their being upset also upsets you. You have a baseline understanding of how they feel; you've felt it yourself; and thus their anger or distress brings up emotions in you. Human emotions are complicated as fuck, so it may not be in the exact same form, to the same degree, or for the same reasons, but you're going to have feelings about the conflict itself, and the person involved, and the emotions they express.
You're going to care that they are upset with you to some degree, even if you don't want to, even if you feel wholly justified and correct in your position, because as a species we rely on cooperation, and conflict is a disruption of that. So if you are a functioning human? You are not going to simply forget about a conflict with somebody else. And if you're a healthy human who wants to remain part of a functioning society, you will want to mend or ameliorate the rift between yourself and that person, so you can continue to live peaceably together.
Kelly, however, is presenting herself here as such a profoundly broken and non-functioning human, she is left untouched emotionally by others' anger or distress, and thus is incapable of resolving conflict in any meaningful way. Posting a vague, "I hope those people who were mad at me are doing okay,, even if they hate me," is something she has figured out she ought to say in order to make herself look more sympathetic, and maybe get those people to do the work of trying to mend the rift so they'll give her attention again. But there's no feeling behind it. If there was any feeling, she wouldn't have forgotten the conflict in the first place.
Given that the cake is on a glass plate, and not a bakery board, I think Kelly made this herself. It's not a pro-tier job, but from what I've seen of her artwork, she's totally capable of doing something like this.
I wonder how much of it our diabetic-with-NAFLD-gorl ended up eating. And gee, how amazing that her long Covid and probable POTS (that her fatphobic doctors refuse to diagnose) subsided
just long enough for her to bake, assemble, and frost a fairly complicated cake.
One hallmark of munchies is that their alleged medical conditions never keep them from doing the things they actually
want to do. Somehow, they're always well enough for a Disney vacation, or to attend a special event, or to work on a fun project. Kelly mooing about how she's afraid she's going to die, and how her whole family will be affected, because fatphobia—then making this cake? Totally fits. Munchies gonna munch.