I agree with previous posters - such a sad predicament with no clear right or wrong.
It was her body but it was the couples baby. They obviously wanted and cared for the baby but seeing their previous babies suffer they wanted to spare this baby suffering.
However I have not had the experience of a late termination and imagine it would be terrible mentally and physically.
I also hated the fact she asked for more money even though it was described as a moment of weakness. If she truly felt the weakness because of hearing about the suffering this baby could face - asking for more money doesn't make sense and sounds greedy.
However it didnt sit right that the parents, once the Surrgate mother found parents willing to adopt the baby - trig to challenge it just to put the baby in state care.
Such a sad situation