*** Spoilers ***
In the film Wonder Tot is taken by her mum to see the Godslayer sword which is going to be wielded by the greatest amazon warrior to kill Ares.
It turns out the Godslayer is an "ordinary" sword and that it's really Wonder Woman who has to do the job.
And nothing here makes any sense, does it ?
Either the Amazons were deceived by somebody into thinking they were keeping the sword that can kill Ares, in which case if they ever had to face him something could have gone very wrong.
It's compounded by the idea that Diana is by design the actual Godslayer while her mum, queen of the badass ladies capable of tearing out your guts through your nose feels her precious girl should do anything but be a badass lady capable of tearing out your guts through your nose.
It's one of those leaps of logic you only see in movies "Whatever you do, don't go into the family business. I'm ok with sending everyone under my command to get killed including myself, but I'm using my prerogative to make an exception for you and making you the odd one out. I'm sure you'll make a fine bookkeeper."
Come again ?
The queen knows that Ares is a threat and the Amazons were meant to fix the problem and they fix it by hiding, putting their trust in a fake weapon and doing everything so that the real "big gun" is vocationally railroaded into flower arrangement …
What if Diana didn't get the "ooh shiny" gleam in her eye when she first saw the sword ?
It's like that old trope of the bad guy who is magically imprisoned for aeons and is "cursed" with something really terrible like apocalyptic level magic or vampirism …