In that case, you cannot make changes to her phone. You cannot even access her account to view anything.
Unless you know her iCloud id/password. You could go to 'find my iPhone' there, but you cannot access it
without it. That is unfortunate.
However, i will give you a suggestion for a future 'gift'. Buy a smart watch for both of you. They have the ability
to tell if someone who is paired with your watch, is walking, driving, elevated heart rate, and location tracker.
I have 2 myself. If they put in driving directions? It even shows up on your watch and tells you their 'trail/location/path'
they are on.
Other than that, you would have to have her consent to give you the information listed above.
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