An overdose, of what?
Kate McCann did the only thing she was able to do she told the police. Whether they took any notice of her we don't know, she was after all completely traumatised and not behaving in a rational manner. Thinking that Madeleine had merely wandered, I wonder if they thought Kate was being a bit hysterical.
Who are we to know what the McCann's were able to do on that night.
Fiona says that Kate was worried about the twins, but then goes on to say 'but they were fine' no doubt she was reassuring Kate that they were fine.
Lets have the full quote shall we;
No, and that was the other thing, she kept going into the twins, she kept putting her hands on the twins to check they were breathing, she was very much concerned in checking that they were okay. But they were okay, I mean, they were fine, they didn't, they were asleep, but at the time it did seem weird, I remember thinking, you know, when the Police came they turned the lights on, there was loads of noise, obviously from the moment Kate discovered that Madeleine was gone, the screaming and the shouting and there was a lot of noise and they, they didn't, you know, so much as blink'.
I can't remember who carried up Sean and Amelie. Erm, and we sat on the sofa, me and Kate with the twins asleep on us for a while, erm, and they didn't wake up and, again, that was quite strange, even in the transfer and, and being handled by people that weren't their parents, they didn't, they didn't wake up.
http://www.mccannpjfiles.co.uk/PJ/FIONA-PAYNE-ROGATORY.htm