I can't make head nor tails out of this.
From the Websleuths site, it seems the mother dropped the kid off at a birthday party. The hosts of the birthday party say they didn't know Cupcake nor the family. It was apparently not a kid's birthday party.
Two children, one of which was Cupcake was seen with another little girl on videotape. When Cupcake went missing, this was the problem, because no one knew she was missing for hours, because she was somewhere where no one knew who she was.
Two people resembling people in the surveillance tape, were taken in. One woman and one man. The woman had prior kidnapping charges but the targets were here own children whom she did not have custody of. The man was arrested and they found child porn on his phone, his bond was set at half a million dollars. Apparently he was able to bond out, because one of his relatives put their house up for collateral.
When Cupcake's body was found, the woman, still in prison had additional charges added and the man was arrested.
The problem with this case seems to be the discrepancy of the woman as being named as black or white. Some people think the woman is trans but her social media, now down, seems to suggest she is a biological woman with masculine features.
The other problem is the parents and their family social media is full of rumors. Some of them very bizarre, like the parents sold their kid to cover drug bills and so forth. Police did nothing to clear anything up, saying, "don't always believe what you read." Well it's true, what does that mean? They didn't deny it but didn't confirm it either.
Finally the mother refused to go in front of the camera. The police later said, they asked both parents not to appear on camera for pleas, but the father didn't listen and went ahead and did it. The mother did, thus another source of potential rumours.