hatter - I've only just seen this (v. long hangover - haven't been on line since Friday morning!). My Mum often wonders about how she worked out that my brother was so unhappy. He was really very tiny (I think he was there from 3 - 6 months). She just knew that something was wrong for him, but the childminder was a very good friend of hers (and had been for about 10 years at that point) so she stuck it out and thought maybe it was guilt! The childminder constantly complained about my brother. Finally one day when my mum was picking him up the childminder left the room and my mum got to see what the other children (mainly her own daughter) were doing to him. She withdrew him immediately. It was throwing things into his cot, poking him, generaly making his life a misery.
My elder brother and I never let on how miserable we were there (some 7 or 8 years before that). She also had children our age (very rare, considering there is a 14 year gap between my brothers), and again it was them that was the problem. My elder brother had to put up with the daughter being a nuisance in class all day long (she never stopped talking) and then when the childminder picked us up from school, she would tell her mum about all the bad things my brother had done at school and he would get into trouble. He was (is) fairly quiet and shy, and so never stood up for himself. If anything ever went wrong at their house, we got into trouble. Once I spent the entire time scraping dog poo off the hall carpet while everyone else played outside - and the only dog poo that was found was on her daughter's shoes! We didn't want to hurt our mum by telling her, besides which there was a lot of mind games going on (you know, if my brother stood up for himself, that was proof of just how naughty he was, and I answered back about the dog poo so I deserved it anyway). I'm also not sure mum would believe us - there were so many versions against ours (maybe they were right - maybe we were really bad!)
As I said, I am avoiding childminders as the ultimate precaution against someone else like her. But I know that she was an exception (although my poor little brother went on to have an equally terrible one when he was about 3 - at that point mum found him a nusery). If I did ever use a childminder (might have to because it is so much cheaper) I would make sure that I asked my kids and the childminder open questions which involved detailed answers about what they'd been doing. And for pre-language children I would read their body language really carefully. I suppose I would also look out for the childminder telling me that my child had been naughty or bad. While parents do have to hear this stuff and be supportive, with both this and a later childminder this was exactly what they said about my brother and my mum believed them, when in fact he was getting seriously bullied by the childminders own children - and the childminder (in both cases) refused to hear that their little angel could possibly have done anything wrong. Is that the sort of thing you were asking about, hatter?