Someone is going to have to prove that by the time she was given the fatal "whatever", she would have been too incapacitated to do it.
Remember, Howard only SAID he helped her to the bathroom. We don't KNOW that is true.
But it says she was too weak to take on what is a normal function...but in good enough shape to get to the meds and give herself a shot...but leave no evidence of it.
If it was a shot, where is the syringe? Was her bladder full or empty??