I had undetected placenta praevia in my third pregnancy. I had one of those ER like dashes to the theatre where they did a C section. They rushed me in because my little girl's heart rate was almost double it's acceptable rate and they thought she might have heart failure if they didn't get her out. When the OB cut into me, he sliced right thru the placenta blocking the cervix. My early scans had shown a low lying placenta, but it was not low enough to cause concern. Obviously it moved or was lower than they thought. The midwife told me my situation was extremely rare and that if I had delivered her vaginally, the placenta would have come first and that she probably would not have survived. As it happens, I was only 1 1/2 cm dilated and was not progressing anyway. Probably because of the placenta blocking the cervix. If your friend does have a C section, it is for the best. I have since had two more babies vaginally after my C section. A healthy, happy baby is definately the most important focus. Wishing her all the best.
Domestic Goddess Mum of Four!