Here’s another AI account on IG that runs kind of a narrative for this girl, but also states, quite plainly in its bio, that it’s an AI persona.
They had her at a smaller bust size and then had her get bigger. Unlike Sierra, they don’t mix and match bust sizes, but keep it more chronological as if she were real.
She started out with the new boobs as if she had caught a cold or something last week, hence the expression.