I think counselling would be a good idea, as she is bound to turn to you for help and advice but you are part of the family and will find it very difficult to be objective. Part of you may be resentful that your wife is being affected by all this, and in turn this affects your relationship. Maybe Relate could help, I think they just ask for a donation, someone else might advise about this. I think that in the end this may all be resolved, it sounds as if the daughter suddenly had a meltdown and wanted to find her birth mother and is going through a lot of turmoil. Eventually, if your wife has been a loving mother, I think the daughter will realise this, but if not, then if she has done her best to raise this adopted child then there is nothing more she can do except leave her door open and not harbour resentment. None of us can know the hidden pain that being given up for adoption may cause, and if she can work through some of that by meeting her birth mother, it may sort a lot of that out. There is always the chance that meeting the birth mother will be a massive disappointment and she may even feel more rejected, and then she will need your wife all the more.