Why the women would choose to have a baby like Ashley when i am not sure even at this point if she knows what it means to have a life.
According to a medical dictionary Ashley's diagnosis of 'static encephalopathy' means
encephalopathy (brain abnormality) that will not progressively worsen. It is not a specific condition or illness, but a general terms for brain abnormality.
There can be many things which influence or cause brain abnormality ... such as the mother contracting a viral infection during pregnancy or usings drugs during pregnancy, genetic causes during the fetal development, birth trauma, lack of oxygen during birth, premature birth, accident or infection during early childhood ...
Reading more about Ashley, it seems that in her case the causes for her brain damage are unknown - so at no point could the parents make a choice whether to terminate the pregnancy or not ...
But generally speaking, while certain tests
can tell you whether an unborn child has a certain condition (such as Downs Syndrome or CP), it cannot tell you
how severely the child is affected,and to what extend it will affect his/her life.
Cerebral Palsy, for example, in it's severe form, can leave a person unable to speak, walk, swallow correctly, care for themselves, be continent ... and you may say it's a very disabling condition!
In it's mild form you may have people who have no problems at all leading an independent and fulfilled life ... and you wouldn't even know that they have a 'disability'!
When parent's are told by the doctor that test X has shown that their child has CP, they have no idea how severe the condition is going to be - so they could choose to terminate a pregnancy which would lead to a very able and independent child being born, or they could choose to go ahead with the pregnancy and give birth to a profoundly disabled child.
It isn't an easy decision to make!