First, I gather from your post that you are not a young person, as you have adopted and married off the child.
which means that there are treatments that are now available which were not available when you were seeking help.
Second, you have a tremendous zechus, actually its a never ending chain of zechusim, as the child is who she is because of what you put in to her.
Third, if anyone thinks about adopting, it should be discussed with a ruv or someone capable of understanding the situation.
there are a few sad situations which I know that the child never knew that they were adopted, the results were disastrous.