Any iphone apps for tracking?

I wanted to keep an eye on my little cousin I was asked to but I don't want her to know that i'm tracking her, I tried a couple but they were asking for her permission, any help?

Try Find my iPhone from Apple but you will need active mobile data

Find my iphone is a good one

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Find my iphone needs you to be on the same apple itunes account.
so if her parents know the password and her location settings are on your in luck

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