Hello, thank you for reaching out to Microsoft Q&A.
Do you have any additional verification methods to prove your identity, such as a recovery email address or phone number? **Please keep at least three verification methods linked to your account. This way, if one method fails, you can still confirm your identity using another method when making security changes to your account.
Regarding the password reset -
Please try using a different web browser or an incognito/private browsing window, and then attempt to reset the Microsoft account password. You can also try switching your internet connection from Wi‑Fi to a mobile hotspot (network) and then attempt to reset the password again.
https://account.live.com/ResetPassword.aspx
If these steps did not work, please use the account recovery form here to recover your(her) account.
Remember to use a familiar device from which you've frequently accessed your Microsoft account, as well as a familiar location. Microsoft will review your responses and respond within 24 hours. If you are verified, instructions on how to log back into your account will be sent to you, and if you are not verified, you will need to submit the Account Recovery form again. You can do this up to 2 times every 24 hours.
Let me know if you still need more help.