Hey there! Nice to meet you!
Based on your description, kindly follow the guide to unblock your daughter's account through this link:
If the issue persists, I highly recommend having her submit a reinstatement form as a last resort:
https://www.microsoft.com/concern/AccountReinstatement?SilentAuth=1&wa=wsignin1.0
(This is not an account recovery webform/ACSR)
You may receive the results via email within 48 - 72 hours.
If she hasn't received a response to the reinstatement request she submitted after 72 hours, please check her email inbox, junk, and spam folders in case she received it there.
Thank you for your kindness and understanding! Please feel free to let me know if you need anything else.
Best regards,
Darhyl