What about this. She doesn't die from Bullets but they can go through her. She heals quickly. They don't hurt rather just like a little cut.
I'd have it that bullets go right through her like a knife through butter, with no damage, because she's a goddess. However, that endangers anyone behind her, so it's better to deflect the bullets with her bracelets. Also the bracelets have some sort of magnetic property, so they attract any bullets to them and away from bystanders.
I'd say there is ample precedent that Diana is highly resistant to magic and mind control in normal cases, and that when she ties herself with her lasso (like Simone had her do in "A Murder of Crows") she would be impervious.
«Speaking generally, it is because of the desire of the tragic poets for the marvellous that so varied and inconsistent an account of Medea has been given out» (Diodorus Siculus, The Library of History [4.56.1])
I like the idea that the bracelets can block a LOT more than just bullets, and that deflecting bullets is something she does more out of reflexive habit than genuine concern for her own safety.
The bracelets have been shown to block most things. From bullets to magic blast. Which makes me wonder should Diana herself ever have experince in doing magic?
I like the mental radio; it makes the tiara serve a purpose as Diana's "third eye."
I really do want them to bring back mental radio and other things.