This thread has brought up so much that it's almost hard to respond to. But here are my thoughts:
1. This midwife is not any less skilled, knowledgeable or experienced than she was when you hired her. If this affects your own risk tolerance or judgement when it comes to your own birth, I think that's okay--I'm sure it will affect hers, at least for a while.
2. A lot of posters are focusing on you getting the details of exactly what happened at this breech birth to lead to the death of this baby. I think that, unless you are considering her as an attendant for an upcoming breech birth, the particular way she handled this baby--at least the breech-specific details--are sort of impertinent, except insofar as they reflect the midwife's practices in general.
3. I'm not sure you'll have access to this information, but here's what I would want to know about my midwife in light of this situation:
--Did she accurately represent to her clients her training and experience with regard to breech? Everyone will give you a different opinion as to how much experience is enough, what sort of training is ample, et cetera--but what is important to me is that her clients made their decision to stay home with complete and accurate information regarding their care provider.
--Were her clients completely and accurately informed of their options? Did she discuss the local options for hospital birth (vaginal or c-section), the possibility (if there was one) of bringing in a more experience midwife, et cetera? And were her clients informed of the risks of these options--the risk of vaginal breech, the risk of c-section, the approximate time it would take an ambulance to get them to a hospital if an emergency did arise, et cetera?
I think there has been a lot of emphasis in this thread on whether or not it was safe/reasonable for the midwife to attend a breech birth at home, and on whether or not her skills and judgment were sound--and I think those are both really important issues, but also pretty arbitrary ones. I think it's important not to overlook the central role that a client has in making decisions for her/their own birth, and the midwife's vital role in that process is to provide thorough and accurate information.
The other detail of the story that I think it pertinent to you, especially in light of this sort of unclear detail about the "abnormal heartrate" and the 4 minutes, is to know (which you might from your prior birth with her) what sort of resuscitation equipment she carries and whether or not her NNR certification is current. I have a feeling that you're missing a piece on that detail--as it is, it just doesn't add up particularly well, in my opinion. But if the baby's heart tones were, in fact, fine *five* minutes before the birth, I'm really surprised that the baby didn't respond extremely well to resuscitation and end up just fine. I suspect, though, that maybe that detail is either inaccurate or incomplete. But that's the other thing I would look into.