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Hey there! Nice to meet you!
Based on your description and the screenshot you provided, your client's account is blocked due to unusual activity.
Kindly have her follow the guide to unblock her 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 web form/ACSR)
You may receive the results via email within 48 - 72 hours.
If she hasn't received a response to the reinstatement request after 72 hours, please have her check the email inbox, junk, and spam folders in case she receives it there.
Thank you for your kindness and understanding! Please feel free to let me know if you need anything else.
Best regards,
Darhyl