https://www.portugalresident.com/2007/05/30/secrecy-of-justice-in-portugal/"Basically, it means that once an issue is in the Justice system, then all information surrounding the issue cannot be divulged to anyone outside the process.
With regard to a criminal investigation, this means that the law enforcement agency carrying out the investigation cannot give any information out to the media.
This includes the name of any person they may wish to interview or any aspect of their enquiry. They cannot say what is happening to forensic examinations or the result of them. If they take someone into custody, they will not give any information out as to the identity of that person."
You will never stop two police officers talking to each other, and I can't imagine how a law will stop two suspects talking to each other.
So I would suggest that Kate talking to her family or to her friends would hardly be considered against the secrecy of justice rule