If the GNR officers had not passed on Kate's concerns to anyone then it is possible that the PJ did not know about them. That could explain why there was no action or feedback from the PJ at the time and would explain why the FLO's were asked on the 5th to bring the subject up with them again.
If you really think that on first meeting the PJ officers Kate would have delegated her frantic fear regarding Madeleine's disappearance to below that of her concern re her sleeping twins, then I am gobsmacked. Her whole concentration on the PJ's arrival would be 100% on what she believed was Madeleine's abduction and as far as she knew she had already informed the police of her concerns anyway. Remember that at that stage she had no idea that the GNR were not 'the police' that she assumed they were.
IMO
The only person who says the GNR were informed is Kate, so that's difficult to verify. As far as I know she didn't tell anyone she had told them until she wrote it in her book years later. We know that her question to the FLO's didn't concern the twins, only Madeleine, so they weren't told.
I'm gobsmacked that you think she would not be equally worried about all her children. As far as she was concerned two of her precious children were sleeping unnaturally and she checked them for
signs of life. She thought they may have been given an unknown dose of an unknown substance by a criminal and she didn't scream repeatedly for them to have the best medical assessment, monitoring and resuscitation equipment available in case their condition suddenly worsened? Even though she should must known that all that is done as routine when children are sedated in hospital with careful dosages of suitable substances administered by qualified doctors?