Yeah--
Humans weren't made to carry 6 babies--the strain on all systems would be gigantic. Even if a woman can get enough food/drink/rest during such a pregnancy to nourish herself and all 6, and maintain adequate heart and other organ functions, the drastic *change* from pregnancy to non-pregnant could be enough to threaten life just by itself. The fact that such multiple pregnancies most often end pretty early is to me evidence that so many babies is 'too many babies' for the way women are designed--the body tries to relieve itself of the excessive work as an act of self-preservation/survival.
think about it--many women, even with a normal amount of blood loss during and after birth, have the shakes, feel cold and/or dizzy, etc, for a few minutes or more. As I understand it, that is about the sudden loss of heat, weight, fluid (water and blood, even if a normal amt) from her body. Homeostasis is an important mechanism for protecting our lives--the body works to keep conditions more or less the same (which is why it can be hard to begin losing weight, for instance). We can often manage sudden changes, but our bodies immediately strive to return to 'usual and normal conditions' on the inside through compensating mechanisms in every system. With too sudden a change in conditions, we have reactions like the one I just described for some women after birth, tho most of the time this is a passing thing and the body is able to soon right itself--the heart soon adjusts to a lesser amount of blood moving through, temperature regulation kicks into gear, etc. A woman might get 'small help' in the form of extra blankets for awhile, drinking fluids and replacing calories soon, but nothing more is needed.
But when I think of the change involved in birthing 6 babies?! Especially surgically (right? didn't read the link). That is a huge change that would extremely challenge the body's capacities to adjust soon enough to sustain life.
So, it could be said that that woman's body had a perfectly 'normal' reaction to severely abnormal conditions beyond the usual capacities to compensate for change in internal conditions.