She did get implants, and AFAIK she still has them. Part of what is confusing you is the fact that immediately after getting them she re-took a lot of her old photos that had performed well and tried to scrub the original, pre-implant, images off the internet. But because that never works, you'll see the same photo with two very different sets of boobs and not have it be immediately obvious when, in time, they were taken.
I think she got whatever Alexandra Daddario got. There's maybe a bag-less fat transfer technique (I haven't looked in too deep). Look at Alex and her sister. I really doubt that one got a full cup size vs the other. And also why Aella's boobs never show the bag when squeezed. I imagine it's some 'rich person shit' 'implant' vs what the dirty commoners get.