She should discuss this with the Clerk in the first instance. The Clerk is the Proper Officer of the Council and responsible for ensuring that the correct procedures are being followed.
If she is concerned about things that are being said in meetings, particularly if those things are a clear breach of the Code of Conduct and potentially against the law of the land, she has the right to record the meetings, either audio or video recording, or to ask a friend or family member to attend and record on her behalf. The mere fact that this is taking place may be sufficient to modify behaviour.
You mention that others have reminded her of the Code of Conduct. Are they suggesting that she has in some way breached the Code?
It is important that she keeps a written record of all incidents, as this will be required if it becomes necessary for her to submit a formal complaint to the Monitoring Officer.