Jennifer,
I know how hard it can be to have to deal with this so close to graduation. Letting it slid and keeping your fingers crossed is a nice easy way out, but will you really be happy with yourself if you do? I don't care how long she has been there or how many people hate her. The point is she was wrong and is discriminating against YOU. You are the only one who can do anything about it, and if you wait til after you graduate, it is going to be meaningless. Once your out of the school system, any complaint you have is going to disappear into thin air.
I worry that if you are not willing to stand up for yourself (and indirectly others who will come after you in the same position) now, will you be able to when it is a doctor or head nurse giving you a hard time? Being a nurse is a big deal - you have to be able to stand up for your patients when they are not able to. That may be hard to do if you are not willing to stand up for yourself first.
Please reconsider your stand with this lady - you don't have to take her head on. But DO document and file a complaint. Maybe nothing will come of it, but it could help you at the end of those 15 weeks when you thought there wouldn't be any problems and there were. Your goal isnt to get her fired - it's to cover your a**. For all you know, she already has complaints filed against her, and yours may finally make the school reel her in with her behavior.
If you decide not to go through with anything, please, PLEASE dont try to butter up to her. I have worked with bullies before, and if you try to butter up to her, she will hold it that much more against you. It's a sign that you are weak and she can not only continue to walk all over you, but knows you won't do anything about either <img src="i/expressions/face-icon-small-sad.gif" border="0">
Best of luck to you, the 15 week countdown has begun! - Do keep us updated on this lady - karma has a funny way of catching up to people.