Morganas Ridiculous Stun Length

I understand that her stun makes her who she is. My problem is that the cooldown and length of the stun is ridiculous. If there is any other champ around with her and she hits her stun, its nighty nighty for the champion. I feel like she needs to be balanced more. Whether that be shortening the stun duration or making the cool down longer. There have been numerous games that I have lost where i am a darius with lots of magic resist and armor and i encounter her full health. She hits her stun and lays down her pool and out of nowhere another champ comes up and tees off on me as i sit there.....for 3 seconds.....guess what.. I dont last long. I do feel like that is the purpose of her stun and she should definitely have it. But its to the point where its a garenteed kill once she hits it..and thats not right.