How to cope with my daughter's decision for adoption?

My only child is 8 months pregnant and has decided to put the baby up for adoption and I have a huge problem with that. Its not like she's a teenager or anything. She's 33, has a job, house, car, and husband. Her and my son-in-law have been married 11 years and have always made it clear that they don't want children. She had a tubal ligation about 8 years ago so when she became pregnant it was a huge HUGE shock. The doctor explained to her that basically, her fallopian tube was cut and tied off, but that over time its possible that the two ends can rejoin. The chances are like in the 2 percentile but fully possible. I believe this baby is an absolute miracle, but she didn't seem to share that. Her and her husband decided that giving the baby up for adoption was the best thing (she doesn't believe in abortion). I am so angry when I should be supportive. I can't help but think about how the baby would feel if it found out its parents could take care of it, but just didn't want it. That sounds pretty horrible, doesn't it? I've begged her to reconsider but she says that its happening and to "get over it." I'm hoping they'll change their minds when the baby is born, but I have a feeling that's not going to happen. They've showed no interest in this baby or the prospects of parenthood and are just focused on "getting back to their lives" once the adoption is over. I asked my daughter, doesn't she feel anything for this baby and she said no and that breaks my heart. Me and several other family members have spoken to attorneys about possibly adopting the baby ourselves and they've all told us, that there's nothing they can do until their rights have been terminated and by that time, the baby will most likely be somewhere else. My daughter told me yesterday they've found a couple willing to adopt. I asked her why they can't let a family member adopt the baby and she said that she didn't want to ever have to deal with the baby and she just wants to give it to this other couple and hopes it'll never contact them again. It hurts me so bad knowing she feels this way about her baby. I want to support her decision, but I'm finding it very hard to. Any advice for me?