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I personally wouldn't tell the parents of the other girls especially if you don't know them that well ... and it could come back on your Daughter ... Which would then leave these popular/powerful girls falling out with her and probably making her life a misery ... If your daughter felt uncomfortable with the sneaking out/drinking/drugs ... Maybe she could just phase herself out of that group ... Just start hanging about with them less and start hanging about with other girls more? That way it would probably result in no hard feelings towards her for not hanging about with them. Or she could just start declining their sleepover invitations ... they will soon get bored of asking her?
Surprised no one has replied. You know the old saw about shooting the messenger, yeah? That's what would put me off trying to tell the other parents. I am wondering if you could productively inform the school.
DD is just 14 in year 9. She is friendly with the very popular girls at school which comes with a whole lot of problems! They have recently started hanging out with boys in the year above. Last weekend when they were all supposed to be sleeping over at one of the girls they sneaked out and went to a party with the year 10 boys drinking alcohol and some of them tried weed. My daughter has told me all this as we have a very good and honest relationship. She doesn't want to fall out with these girls as they are very powerful but also doesn't want to get involved in some of the things they are doing. Also I feel I should let the other parents know what their daughters are up to but don't really know any of them and not sure how they'll react