AIBU for not agreeing to my 12 year attending a "birthday party" which she has been invited to. The party consists of the children taking the train unsupervised into the city while the mother of the birthday girl drives herself to meet them. The 12 year old girls will then be walking around the city to shop again unsupervised and will return home alone on the train in the evening. Apart from the obvious danger, all expenses of travel, food and shopping is to be met by me, plus a present for the birthday girl, total cost approx £80. I have totally refused to allow DD to attend. I wouldn't even call this a birthday party. DD in tears as all school friends going.