A pregnant woman in NOT and incubator. It is NOT her job to supply and infertile couple with a baby. SHe is NOT required to honor any pre-birth promises. The law recongnizes that she has time after birth to decide what she REALLY wants.
Yes I get that it hurts. My neice was given back at 2 weeks because her mom changed her mind. Two years later it still stings us all. Most my sister in law who is not able to have her own babies. But she knows she did what was right.
And NO the BM does NOT owe them any money. They gave what the did KNOWING she had a right to change her mind. It part of adoption.