No amount of strength is going to help if no part of your body is between the gun and the direction it wants to go, which is counter-clockwise with her trigger finger as the fulcrum. Maybe if she had strong fingers she could hold the gun in place by the grip, but we're talking robot-level strength here.
It's not that big a problem, she's not shooting it yet so she can still place her thumb in the right place before that. It's incredibly awkward to hold the gun like that, I doubt she's stupid to not notice that.