Channel72 said:
But I think Padme’s death doesn’t quite work as an ironic self-fulfilling prophecy, because Padme doesn’t actually die from anything Anakin does to her directly, but rather she dies mysteriously of a broken heart later on. Maybe it would have worked better if Padme actually died from complications during childbirth brought on by injuries she sustained when Anakin force-choked her.

Well, here’s the thing: her heartbreak is due to the fact that she saw what Anakin had become, what he had done and what he intended to do. It’s not something that came out of nowhere, but is the direct product of Anakin’s actions. She died because she couldn’t handle seeing what Anakin did and what he had become. In this sense, I think you can still say that Anakin killed her, and it still works as a self-fulfilling prophecy. If Anakin didn’t turn to the Dark Side and remained loyal to the Jedi and to Padmé, he would not have done all the things that caused Padmé to get depressed, have an heartbreak, and subsequently die. This is, among other things, the explanation given by Lucas himself.