Based on my viewing of the show from day one, I will say that nothing will convince Michelle that it's not safe to continue with pregnancies. Because of her obsession, common sense principles make no sense and hold no water to her, because in her mind, God is able to overcome any risks AND it's not her decision to make. She must continue as long as she is alive. That is the position she has demonstated from day 1.
I'm not certain which came first. Was it her faith that causes her to want unlimited babies or her desire for unlimited babies that led her to her faith. I personally suspect that she found a faith that supported her unusual hunger for multiple children and I think the hunger for so many babies came as a result of ATTENTION OBSESSION. I don't mean that in an ugly way, but in a serious, sympathetic way. (I actually like Michelle and find her quite good hearted and charming.) Women can manifest this insatiable appetite for attention in many ways, including Munchausen (sp?) By Proxy, hypochondria, etc. They are recognizable conditions. I only hope that Michelle gets any treatment she needs before she loses her life.
(No, I am not saying she has any of the conditions above. I have no evidence of that. What I do have is plenty of evidence that she constantly puts herself as the center of attention. She has done this since the show started.)