There is no legal right to be raised by your own biological parents. Mary's "real parents," in the eyes of the law, are her adopted parents.
Parents who surrender a child for adoption, or simply abandon that child, cannot be sued by that child for that reason alone. Generally, state law (which controls) specifically authorizes parents to do so without civil liability, and in most cases (i.e. barring criminal child abuse or neglect), without criminal liability. The statute of limitations for criminal liability would have run long ago in any case.
This is done to encourage parents who can't handle being parents to promptly give up a child for adoption, rather than creating a legal incentive for the parents to continue to keep a child in a bad situation.