Personally, if one guy decides to shoot another while god is omnipotent, I don't think that means that god must have pulled the trigger. Just becuase he was capable doesn't mean he had to, especially is he wants to let us do the pulling.
So if God didn't pull the trigger (throught the guy) then she wasn't meant to die. Because if she WAS meant to die, then God DID kill her.
And if she wasn't meant to die, they God failed her, and isn't omnipotent.
Or we can just say we cannot nuderstand God. And chose to believe blindly. Liek the people who believed in the God of fire and season. Exactly like them.