Do you have sanctions for detentions at home or is the detention the sanction?
Dd1, y8, 12 has had three in the last three weeks, none previously. Two for chewing gum and one for jewellery (I don't know the detail in this one yet!).
Don't know whether to take her phone away for the evening or just to leave it as the detention. It's not a pattern o want to continue!
Personally can't get worked up over either 'offence' but rules are rules...