Wife cannot check email

My wife has not been able to check her email for a couple months. the reason, is her account is under my account, it didn't used to be but when it changed to currently, shortly after that, it started (we are on legacy sbcglobal emails). When she tries to log in she gets this error "Looks like you’ve tried to sign in unsuccessfully too many times. Recover your ID or reset your password to continue." so if she changes her password, it changes my password. Then she can log in once. The next time she logs in she gets the same error. I have tested this and it doesn't matter if it is 10 days or 10 seconds, it immediately goes back to the same error. So if she wants to check her email, I have to change my passwords on all my devices. this really (Edited per community guidelines). Someone suggested unlink her account, and someone else said no don't do that she will lose her account and all her emails. HELP!