I think she was not prepared properly by the US equivalent of social services - she also had very little practical support with 5 children and a husband working away.
I know that adoption breakdown is about 1 in 6 in this country (a lot due to attachment issues).
I can see why she came in for a lot of flack - she comes across like a complete perfectionist, she expected to feel the same, strong bond with her adoptive child as with her biological children. I think that is much more rare than discussed.
What people who are successful at adoption and fostering do is act in a much more adult way - they accept they don't feel the same and they try to treat them the same so that the adoptive or fostered child does not know. It's what 'good enough' parents do.
I think people who genuinely feel the same aboout their biological and adoptive are very lucky.
I have no experience of biological children but I know that I love my foster daughter but I would still put her needs above all of my emotions were she to be returned to her mother.
I would move heaven and earth to make that transition easy for her becuase I am the adult here.
I really hope that little boy in the article can come to terms with what she did as I imagine the rejection (twice, from birth family first) will be huge.
I would be very unlikely to do what she's done as I would put the needs of the child first.