Sorry, I should have quoted you in my other reply. Yes, it was her first curfew violation and yes, it was a local curfew ordinance.
Thank you for answering my questions.
I briefly looked at a few curfew violation ordinances in your state. It appears that if a police officer has probable cause to believe a person is a minor in violation of curfew, the police officer can stop the person and ask for identification.
If the police officer smelled marijuana when he was at your daughter's car or saw marijuana in the car, that can support a search. The police officer members of this forum can expand on this for you.
With a first curfew violation, an officer generally will contact the minor's parent and have the parent pick the child up or will himself transport the child to his/her home. If a parent cannot be reached, the officer generally takes the child to the police station until a parent is available. First curfew violations generally result in a warning only.
But there seems to be more to the story, and the marijuana that was discovered in your daughter's possession complicates matters.
Here is a link to Mississippi's marijuana laws:
http://norml.org/laws/item/mississippi-penalties-2
If you are unsure of the charges, you can wait to see what comes in the mail or you can call the station. Depending on the charge, you might want an attorney for your daughter. The search of the car raises questions best reviewed personally by an attorney in your area.