My 15yo niece has been self-destructing over past couple of months - it's a long and harrowing story - she is currently living with a 17yo boy at his parents' home. Neither his mother nor his guardian (grandma) are happy with this but accepting it rather than let her go onto street as she refuses to go home (because her parents won't let her drink, smoke and sleep around in front of their younger child). They have both told Dsis that DN is smoking, drinking heaps, and sleeping with the boy - except for the other night when she decided to spend the night with her ex, thus deeply upsetting the 'current' bf.
DN does not currently have a phone; she is on anti-depressants (for PTSD) that should not be mixed with alcohol and which knock her out at night; she has no money; although she's assured the boy's family that she won't fall pg as she has an implant and he uses condoms anyway, to her parents she insists she isn't drinking or sleeping with him and is livid they dare 'assume' these behaviors are taking place. (She doesn't know the boy's family have been in touch).
Now DN wants to go away for the weekend with this lad and his friends, mainly older, who form a youth scene of hanging out in the city centre at all hours, public drinking, drugs, and generally being in trouble with police. 20 of them are going to camp on a beach 4hrs drive away; the lad only got his license today but has the loan of a BMW.
DN has asked her parents (by text) if she can go. Dsis's first response was "we do not give permission" and that if DN went they would have to get authorities involved for her own safety - DSis is not only frightened for DN's safety but also worried about the consequences of being seen by the authorities to 'allow' DN to break so many laws (underage drinking, underage sex, etc).
On the one hand, Dsis realises that calling the police and dobbing her daughter in will destroy what's left of relationship with DN; on the other hand, how can she in good conscience let DN go ahead without objecting? Or is she just supposed to object and then let them get on with it, hoping they don't get a call?