Or, you know, she could just track it without any app at all and share it with you in person.
Computers are useful tools that do useful things for people. It is reasonable for people to want to use them to do things they find useful. They don't have to function like spy devices, but we've chosen to highly reward the people who have turned them into spy devices, so they do. We could choose to do something else with them instead. For example we could pass & enforce privacy regulations so they cannot function as spy devices. Or we could wheel out the guillotines so there are appropriate consequences for the creeps and sociopaths who choose to build and work at places like Facebook. Whichever, I'm flexible.
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You could also be snarky without internet access