No it just can't because they hold no seats. No power no responsibilty for out come!
I would have arrested her for obstruction and interfering in police business.
They have no reason to tell her the charges unless she is the clients attorney. UNtil the driver sais ya this is my attorny they have no requirement to tell her any thing. I think the cops behaved as adults here. If they jailed every body that acted this way our over crowding problem would be worse than it is All she had to do was ask the driver and get an ok to be their attorney. Then she could compel testimony with in a reasonable time. Just ask the driver and quit being pissed off!
Pissed off people sure are stupid!