Having a child appears to have been God's call in this instance.
So many children need homes, it seems very egotistical to pursue biological children when nature is unwilling to provide them.
Are you saying that this woman miscarried as some sort of punishment or divine justice???
There's a shortage of babies thanks to abortion on demand. The red tape involved to be approved for adoption can be prohibitive too. There's more than one reason that they may have chosen this path. We really don't know.
Also a lot of couples are afraid of getting attached to a child only to have the biological parents change their minds a few years later and the courts siding with the biological family.