We aren't talking about Diana's mental or emotional health all of a sudden are we? We are talking about things/weapons that can hurt and potentially kill Diana. If magic can harm Diana is that not a thing that effects her physical person?
You are seriously choosing to ignore the MASSIVE elephant in the room. Diana's godlike powers are a thing that exist. Speed is one of them.
Seriously ask yourself... What would make sense for a magic clay formed amazon that was gifted with godlike power from the Gods and Goddesses of the Greek pantheon to have as a weakness? Well, she possesses power greater than that of any demigod I know of but, she isn't really on par with the head Gods either. Since she is considered one of them it would make sense that their weapons can harm her. I would imagine that the deadly poisonous monster could also harm her, see as not even other demigods or heroes were immune. Clearly anything outside the boundaries of man kind should harm her; alien tech, new god technology, etc... Obviously cosmic entities more powerful than her can harm her, other Gods.
But, man made weapons? why would man made weapons have any effect on her what so ever?