User last name changed, now cannot unlock locked computer with that username even though she logs in initially with it successfully

We had a user get married and we changed her last name in AD (2012 Std).  We use first initial last name.  Now when she logs in, her workstation (W7 Pro 32) accepts her new username, but when the computer is locked and she goes to log back in, even though it shows the correct first initial and last name is the one who locked it, it will not accept her logging back in, she has to do Switch User and put in her old first initial last name with her correct password to get back in.  I have researched this online and found others have had the situation where the lock screen would not unlock using their username and password, even when their name had not changed, and they would have to reboot and get to a login screen to be able to get in, but no one seems to have an answer.  Anyone?

05/22/18 For some reason I am unable to post a Comment - click the link and nothing happens - but this user is being given a new PC, so this has become a moot point.  I appreciate your responses.
jeoincAsked:
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David Johnson, CD, MVPOwnerCommented:
Personally I'd have just changed the display name and not the samaccountname AND display name.
Back up her profile data, delete the profile, log in the user with the new details, restore the profile data.
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Shaun VermaakTechnical Specialist/DeveloperCommented:
Run this on the DC and post the result here. Personally, I use employee numbers.
Get-ADUser "THEUSERNAME" -Properties *

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jeoincAuthor Commented:
Hi, thanks to everyone who responded.  This issue is not dead, but it is a client I only visit for a brief time each week, and we have had mandatory things to get done the last few weeks.  As this is what might be considered a less urgent issue, I haven't been able to look at trying any of the things suggested.  Tuesday is the day I am normally there, it will be next Tuesday before I can possibly get back to this.
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jeoincAuthor Commented:
User is getting a new system.
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