She wasn't arrested. She was detained and taken to the police station and her family brought her documents to prove she wasn't the other woman they were after.
In many countries people can be held for significant amounts of time without being formally charged with any crime.
https://criminal-law.freeadvice.com/criminal-law/arrests_and...
This is what happened (detention): "I was working and the police arrived. They confounded me with someone else they were looking for and I had to go to the police station and prove I wasn't that person. What a day".
Not this (arrest): ""I was working and the police arrived. They confounded me with someone else they were looking for and I had to go to the police station and prove I wasn't that person. They still didn't believe me and I'm in a jail cell waiting for a judge to hear my case. I don't think I'll be home for a few days".
Good thing no one is ever harmed while being detained but not yet arrested. /s
> She was detained and taken to the police station
What's that if it's not an arrest?
An arrest is when you're charged with a crime. It's a much more serious situation.