I said that Lucas has confirmed Padme will not die in Episode III. As for her dying later oh yeah anything is possible!!!!
In fact she should die in between episodes III and IV if Lucas stays true to his dialogue. Remember what Leia says about her mother. She said she remembers just images of her cause she died when Leia was very young!
So yes Padme does die after episode III, when and how is unknown for now.
And as for spoilers, I always mention before hand if something is a spoiler!
Hope that cleared things up guys!
