1 day for a minute? The punishment should fit the crime, in my opionion the punishment in this case is far, far greater than the crime. She kept in touch, you knew where she was, you could reach her if need be. She should have respected the rules and I do believe that there should be some "cost" to her for not being home on time.
I understand that once you make a rule you have to enforce it but I just keep thinking of my friend's teen brother that was speeding home because he was late for curfew. He lost control of the car and died. I know that is an extreme scenario but I just worry that if there are severe consequences for lateness that a child might put more of a priority on getting home on time than getting home safely.
I agree totally, punishments should fit the crime. Anything could have happened in those 10 minutes to make her late.
I personally think she was being quite responsible by letting you know she was going to be late, after all, if she thought she was going to get grounded for 10 days for being 10 minutes late then why bother telling you in the first place, she could have just rolled up late, the punishment would still have been the same.
We have rules and consequences in our house too but in some instances I let my children choose their own consequence, sometimes they actually punish themselves harder than what we had intended
I come from a military background with strict rules, consequences and punishments and it was a living nightmare, I felt suffocated, claustrophobic and very alone, it also pushed me away and I ended up hating them.
I rebelled, got into trouble, did crap in school for a while and tried to end my life a few times so I refuse point blank to be like that with my own (8 and 10) and for the most part it's fair punishment but I am not a pushover and thankfully my kids don't really turn on the water works because we talk about what they did wrong and what they think they should have done etc.
You have rules and that's good but sometimes rules need to be different for different people. No two people act the same so the punishments should fit the people too.
I hope you get to have a peaceful weekend anyway!