What's the best way to locate another iPhone without them knowing?

I’m worried about my teenage daughter’s whereabouts when she’s out with friends and was wondering if there’s a discreet way to track her iPhone location. I’ve heard of using iCloud to find a lost phone, but I’m not sure if that’s the best option for monitoring someone’s location without them being aware. Is there a way to do this without her knowing it’s being done?

There is no ethical or legal way to track her iPhone without her knowing. Using her device without consent risks breaching privacy laws.