I am shocked at what people are saying about my home. I have been a single mother for years here on Thamesmead. It is lovely. And yes, children play out around their houses, nothing unusual there. Outside my window yesterday there was a 6 year old a 7 year old and an 8 year old playing together. I know them, and they were all within view of their mum's kitchen window, but you wouldn't know that if you just walked past.
I don't walk around alone at night, but that is more because of the "landscaped" lay out, beautiful by day but a bit of an unlit maze by night, particularly in the places where the pavement doesn't follow the road, but goes under it, along side canals, and through shrubbery.
I have run a brownie pack on Thamesmead, and we used to have a lot of children show up alone and go home alone, even in winter in the dark. We didn't like it TBH, but couldn't change it. For most it was a short distance, and the best we could get was a promise to ring us if a child was late back, and drilling into the girls that they had to go straight home, or we would get a call
There is some crime here, mostly drug and gang related, but if you don't get involved in that, then it is really quite a nice place to live. I don't recognise the terrible sink estate being portrayed in this thread. There is a great community here.
I am very afraid this poor little girl has gone into the Thames, it can look so cool and inviting on a hot day. As to why there appears to be so long between last sighting and reported missing, yes, that could be neglect, but could equally be each parent thought she was with the other.