Thanks for your post on the Community Forum and welcome. I'm sorry that you've been charged for going over data on your daughters phone.
Please see the suggestions below for ways to manage your data usage:
Use the Virgin Mobile Your Account app to keep track of your data usage balance (Install from your app store)
Login to Your Account online to view Recent Usage
Settings > Data traffic management > Traffic reminder settings > Monthly data limit > manually enter your package's limit
Settings > Data traffic management > Traffic reminder settings > When over monthly limit > select 'Disable mobile data'
Set up each of your apps, app store and OS to only update when connected through WiFi
Download a third party app that will track your data usage
Also, please see our online Help & Support page: Managing Your Account for Virgin Mobile. You can also request for a cap to placed on the mobile. The lowest cap is £50 and you can get in touch with us direct to arrange this on 789 (Freephone from a Virgin Mobile), 150 (Freephone from a Virgin Mobile or Virgin Media landline) or 0345 6000 789 (from any other phone).
Virgin Media Forum Team
Need help changing SIM card? Find out more about activating your 4G ready SIM. 4G SIM Swap Help