Our funny mishaps were I almost ran over one of my bridesmaids because I was still learning how to drive a stick shift and realized you HAD to put the emergency brake on while parked on an incline. LOL! Then our moms accidentally lit the unity candle TOGETHER so when we went to light it, … Read more
Yes, you are - UNLESS she is engaging in dangerous/unhealthy activity such as drinking or doing drugs, it is not your place to enforce her parents' punishment.
(IMO, if the parents' expect her to abide the punishment while they are gone, they are incredibly naive.)
You can remind her of the possible consequences of her actions---including the potential trust issue---but anything coercive in nature would in fact be overstepping your boundaries (this is not an "emergency") and crossing hers.