I was tied to my mother's mobile phone and accidentally charged the money when playing games. Will my mother's mobile phone know?

You are still two independent mobile phone numbers, so she should not know. But if you don't agree to play mobile games at home, try to control it. You can exercise your self-control by controlling yourself to play mobile games. If you feel tired at first, you can download some leisure mobile games as a transition, and you can download leisure mobile games in the App Store. App Store's mobile games are very comprehensive and can be found in various types.