We had somewhat of the same placement situation, though not the same problem.
DD's bparents placed her because their first child had been removed from their home and placed permanently with a grandparent. They had already been told DD would not be going home with them and they did not want either set of their parents to have her.
That's where we came in.
DD had been home with us for about a week when we received a call from DHS in the county she was born. The agent politely asked me if we had DD and I said yes. He started asking about whether we'd gone through an agency, whether DD's bparents had signed TPR, who had been there at signing, etc. He said "someone" had made a complaint about DD being missing and while things sounded on the level, he would have someone come out and confirm we did have her and she was the child in question.
I FLIPPED. I called my agency just this side of hysterical. Our rep calmed me down and told me not to worry, she'd get to the bottom of it. Half an hour later, she called back to say that the grandparent who has custody of DD's bio sibling had called in a complaint when she realized DD had been born and no one had called her. She'd assumed she would have DD too.
Our rep. was great. She assured me that placement of DD was still the bparent's decision, and that everything had been done on the up and up. A social worker did have to visit us to look at our paperwork and actually see DD, but that was it. We never heard a peep again.
I'm so sorry you're going through this, but I don't think there's anything that can be done at this point to nullify the adoption. Certainly if she could prove coercion, but that doesn't sound like the case.
We had the same concerns and were told that if the adoption was contested, DHS would become involved and while that would drag the process out, it would basically mean we had nothing to worry about.
Hang in there!
