to preface, i did not see any of this myself, and am purely going off recollection of what others have said
apparently during her break, around the time when her surgery would be, a doctor who is apparently near her location and speculated to be the surgeon, had posted something on social media that was pretty dead on description of maimy. this information was supposedly removed shortly after as well.
i dont know the extent of what was posted and have absolutely zero idea how to verify any of this, but from what i remember it was taken as confirmation by some that she did actually have a surgery of some sort.
that being said, the surgery we were told was going to happen (fat transfer breast augmentation) has a wide range of results, so its completely possible that we would not be able to really tell. so unless we get any solid proof one way or the other, speculating on it is almost useless
edit add: her BF was also very defensive about "her choice and can do what she wants to feel good about herself" so thats also something