Thank you for those details morimoto_ltd,
If you’re not signed in to your Apple ID on her devices the AirPods shouldn’t automatically connect as it requires your Apple ID for that feature to work. That information can be found in the article Switch AirPods between iPhone and other devices that was previously linked. When you’re seeing the AirPods connect on her Mac and iPhone is that in the Bluetooth settings? If you’re unsure, you can view the Bluetooth settings for each device following the steps below.
For Mac, click the Apple logo towards the top-left, followed by System Preferences > Bluetooth. If you see your AirPods in the list of devices, you can move your cursor over the AirPods name, then click the (x) towards the right of the name to forget that connection.
For iOS and iPadOS devices you’ll want to go in to Settings > Bluetooth, tap the (i) towards the right of the AirPods name, followed by Forget This Device.
If that doesn’t resolve the issue you’ll want to proceed with resetting your AirPods. Those steps can be found in the following article.
How to reset your AirPods and AirPods Pro
Take care!