Is drawing on an unarmed attacker justified if you are significantly smaller and weaker and have no chance of winning a fight?

Say a 100 lb. woman who doesn't know how to fight is being rapidly approached by a big ol' 300 lb. lunatic saying he is going to rape her and bury her body in the woods - from everything i read it seems pretty clear cut that she would still be in the wrong for drawing and threatening or using lethal force against an unarmed and therefore "non lethal" attacker. this seems ridiculous. is that really the case legally? she is legally restricted to fighting with her own bare hands until the attacker pulls out some kind of weapon? via /r/CCW https://ift.tt/2JI7hAB