please check my answer thanks :)

Sally sues for malpractice, claiming she didn't know that the operation could have ( and in this case did have)negative consequnces. Your office has a copy of an informed consent signed by Sally. How will this affect her case.

My answer Sally's malpractice case will be affcted because she consented to the operation knowing all of the risks regaurding the out come. By signing the informed consent the doctor adequately informed Sally. (not sure what else)

Your answer is good.