She has absolutely botched her natural face, no denying that. Fake tits might might be necessary depending on how her post pregnancy ones looked like, since they were relatively big during pregnancy compared to her pre ones, wouldn't be surprised if they just didn't look "good" in a porn standards.
You know that Gianna is a high profile porn actress, she has a "position" to maintain, hence no pregnancy stuff was made. It's all a facade, but she has to keep this look, if she started to sell some niched kink shit it would reek desperation lol
As to her being a multimillionaire, brother I think you're underestimating how fast some of these girls burn through money... Kendra Sunderland is my fav example, with all her exclusive contracts with VMG she should be loaded, and bitch is struggling lol