Did you read the article? Her other two children had been born by elective cesarian. The baby was distressed and a vaginal birth could/was likely to result in a uterine rupture for the mother which is a huge life risk.
Her other children had been removed for her under the italian care system and were permanently with her mother who had said that she could not/would not care for the baby.
Whatever the reason for her ceasing to take the medication, she had done so and was suffering from psychotic hallucinations.
This comment on the piece I thought particularly worth reading too.
"As a mother with bipolar disorder who has suffered from paranoid delusions I have been horrified by the coverage of this case. To go through labour while paranoid and psychotic, unable to understand either why you are in pain or that the people around you are trying to help, would quite literally be one of the most dreadful experiences that I can imagine, and if this woman was that ill a caesarian would absolutely be the only humane way to proceed.
There seems to be a general refusal, particularly in the liberal press and blogosphere, to accept that really serious mental illness and a consequent lack of capacity exists any more, a belief that everything can be done by consent and that anything else is merely prejudice against the mentally unwell. It’s an understandable backlash against the time when we were routinely denied our rights but it does those of us who occasionally really cannot make decisions for ourselves no favours. In this case it seems from the limited information supplied that the court was definitely the appropriate places for the issue to be raised and a decision to be made in light of medical advice."