I just wanted to say something supportive. You didn't fail; a bacteria affected the situation more than modern medicine was capable of handling. I hope you're not blaming yourself.
I've had two law offices, with two separate sets of medical experts all tell me that this did not happen in the hospital. We live in a day and age where critical thought forces you to ask the next question. Well, then where did she get sick, and who was in charge. Sometimes it is that simple.