Ok. Well, I will agree with you in terms of your point about the bustier being sized smaller therefore creating the illusion that it is 'overflowing'. This technique in conjunction with padding is often used with models on shoots, shows, commercials etc.
I also agree that one can never fully prove 100% by pictures alone that someone has implants because technically, in order to prove the presence of an implant, one must have corroborating mammographic evidence. Seeing that none of us here will probably get hold of the latter, I don’t think it’s over-reaching to assume based on photographic evidence i.e. before and after pictures, that she got a boob job.
Like I said before, it’s a matter of interpretation, interpretation however, that’s influenced by individual experience.