So even at that stage ... prior to anyone having a clue what had become of Madeleine who might for all anyone knew be found that morning, bearing in mind that the GNR and whatever dogs they could muster probably were still hoping for that outcome ... the McCanns were being singled out for special treatment with their own personal social worker.
I think you make an unpleasant inferrance there Brietta. Yvonne Martin was simply going to help a family in distress. Nothing more, nothing less IMO. Yourself and others have inferred she went there to interrogate them rather than simply help as much as she can. To do this she of course would need to ask some questions first so as to find out the facts.
She appears to be one of the people who would cross the street to help someone in distress. Some on here apparently seem to think being a good samaritan is never of any use, perhaps they would cross the street to avoid someone in need.
Just my opinion of course.