This country is far from a facist police state but, there are a host of reasons this is wrong.
She should have the capability to disable the app when she's off the clock.
The employer should have worked with her to accommodate that. They should probably provide the tracking device instead of using her phone.
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If you're not on the clock, turn off the phone. It's a company provided device, so don't tamper with it, but you can shut it off.
This country is far from a facist police state but, there are a host of reasons this is wrong. She should have the capability to disable the app when she's off the clock. The employer should have worked with her to accommodate that. They should probably provide the tracking device instead of using her phone.