Daughter wants a nine-day road trip to Spiti with three friends before she starts work

Final semester is over and she is home, sleeping late and planning. The plan is a hired car and driver from Chandigarh, homestays booked through a friend's cousin, nine days, four girls, all 21 or 22. I'm not against it. I went to places at her age that my parents didn't hear about until later. What I'd like is to understand what a sensible check-in looks like for something like this without becoming the mother on the group call every night. My partner, who is home on a career break and has time to worry, would prefer daily location sharing. Our daughter says that's 'surveillance'. What did you agree on when yours did a trip like this?