She didn't go too big, if that helps. But my condolences, as I, too, am an appreciator of smaller perkies.
This isn't about her Substance stuff or what happened in the Sabrina Carpenter music video. We all know those were prosthetics and very push-up stuff. But for the better part of a year, we have seen image after image of her with bigger breasts and no, a little bit of extra weight here or there and a push-up bra is not going to make that kind of difference so consistently. And often the enhancements are most noticeable because she clearly isn't wearing a bra and/or anything that would "push" anything up/together so well.
I think because people see both pre-op and post-op mixed in due to film/etc. releases that were shot pre-boob job, it may give the impression of weight fluctuation or something but if we look at candids chronologically, it is obvious. For example, these
bikini pictures. The big giveaway is how they are both fuller in the tops of her breasts and generally more round overall. And her boobs have never been that way, as we can plainly see, given her many topless roles.
About the only thing that could naturally explain her growth is pregnancy and well, that certainly never happened.