The solution is to refuse to roll down your window - just crack it. When the cop asks to roll it down, say no.
The cop will be innocuous and say "It's just so I can hear you better", to which you reply "I can hear YOU just fine".
Cops are trained to look for openings. Don't give them one.
It was her Dad who was giving her good advise.
Young folks have always been cop targets btw and those with heavy badges routinely have their way with many young folks simply because they don’t know the law, or what to say or not say and have little knowledge of their basic rights.