There's an easy solution to this. Unpair it from her partners device and pair it to her device. I did this with my wife as she was constantly receiving alerts that she might be tracked. I never receive those alerts. It's almost as if Apple knows the gender of the owner and if it tracks a woman being tagged they see those alerts more often than men. We have 2 dogs, 2 trackers both paired to her phone not one tracking alert on my phone since registering.