She could always go back to the GP (1) and insist that no details are passed on.
The link Jake has given is very good.
Doctors may be forced to give up information - reporting stab and gunshot wounds springs to mind.
Actually the information is almost always just the name of the patient and the address he gave.
I was gonna say psych reports are hardly ever traded BUY
here is the leading legal case: since you posted under law.
W v Edgell [1990] 1 ALL ER 835
The patient was a prisoner in a secure hospital following convictions for killing five people and wounding several others. He made an application to a mental health tribunal to be transferred to a regional unit. An independent psychiatrist, Dr Edgell, was asked by W’s legal advisors to provide a confidential expert opinion that they hoped would show that W was no longer a danger to the public. However Dr Edgell was of the opinion that in fact W was still dangerous. W’s application was withdrawn. Dr Edgell, knowing that his opinion would not be included in the patient’s notes, sent a copy to the medical director of the hospital and to the Home Office.
The patient brought an action for breach of confidence.
The Court of Appeal held that the breach was justified in the public interest, on grounds of protection of the public from dangerous criminal acts. However, the Court said the risk must be ‘real, immediate and serious’.