My mother forgot password for Apple ID
How to change Apple ID password
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See If you forgot your Apple ID password https://support.apple.com/en-us/HT201487
You also can use Having trouble signing in/iForgot https://iforgot.apple.com/password/verify/appleid
You also are likely to need to see If you forgot the answers to your Apple ID security questions https://support.apple.com/en-us/HT201485
See Change your Apple ID password https://support.apple.com/en-us/HT201355