According to the bishop who declared the nun excommunicated:
We always must remember that when a difficult medical situation involves a pregnant woman, there are two patients in need of treatment and care; not merely one. The unborn child's life is just as sacred as the mother's life, and neither life can be preferred over the other.We all need to recognize that an 11-week fetus is not able to survive on its own. So in this case, if the abortion were not performed... both mother and child would have been likely to die.
In other news, Obama's healthcare bill has created some opportunities for abortion opponents to restrict access. Arizona and Tennessee, are two states that have enacted new laws that would restrict access for people who receive their insurance through exchanges (which is estimated to be about 30 million people). So this would extend beyond federal plans if private plans operated in the exchange. You can read more about this and other laws attempting to take away women's rights from an AP article.