It really doesn't matter. It's her body, and therefore her right to have as many children as she wants and is capable of having, as well as to use any fertility drugs, aids, or treatments she is capable of affording or otherwise obtaining.
This is a right that very few (if any) other women care to exercise to this extent. That doesn't mean they don't have the right, simply because they don't choose to exercise it.
The fact that one woman (or two, if you count Michelle Duggar) chooses to exercise- to the fullest extent possible- her right to bear as many children as humanly possible, does not concern me overmuch, as it is a self-limiting right, and there are a finite, 2-digit number of offspring one woman can produce- with or without fertility aids and treatments- before she drops dead of gestational diabetes, toxemia, and hypertension, runs out of eggs and enters premature menopause (a common side effect of overuse of fertility drugs and procedures such as IVF, which remove multiple eggs from the ovaries), or simply ****s out her uterus and has to have it removed (this is called uterine prolapse and was common in the days when women routinely bore eight or ten children).
I think it's actually a pretty impressive feat, although not, of course, one that I'd be at all interested in replicating. Now let's see what she can do with all these children. Perhaps her parenting skills will prove equally as extraordinary as her progenerative capacity. Who knows?
There's nothing about having a handicapped child that makes one unfit to have more children- even many more, if that is one's desire.
We should all just be grateful that women, not men, are the ones who get to decide how many children will be born, since a man is theoretically capable of creating hundreds, perhaps a thousand, while a woman can only produce a dozen or possibly 20 at the absolute, outside max.
It's such a rare and exceptional occurrence when any woman actually does it that I don't see any point in fretting over it.
It happened, and it's her right.
And who knows, maybe she'll foil all these dire predictions and actually end up taking decent care of the poor little buggers. It's her right to try, anyway. They're hers. She made them.