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You'll get the whistleblowers protections from the insurance company, as well as setting up the bank's IT department for a full audit.
Add in a call to the regulator, as these actions mean that they will be acting out of compliance with the security reg's for their banking licence.
Bonus points if you own any stocks in the bank, as that makes you a minority stockholder which adds in another set of legal protections.
This is the right way to do things.
The bank's IT department will be liable for all of her extra expenses, and the Bank's HR department should be involved, as well as the bank's insurance company.
No proper off-boarding procedure, which means that they cannot confirm that everything was done properly.
If the banks IT department are screwing up like this, then where else are they failing to do their job.
Report them, and act as whistleblowers to the insurance company.