Keep her locked out of the system and send her a formal letter that she has been found redundant and her services are no longer required. In my non-lawyer opinion this would meet the UK’s labor law requirement.
“In my non-lawyer opinion this would meet the UK’s labor law requirement.”
Dublin, where the woman was employed is in Ireland which is not part of the UK. Ireland is a member of the EU so her employment is governed by Irish and EU laws and regulations. The UK is no longer part of the EU.
While a few counties in Northern Ireland are part of the UK, Dublin is the capital of independent Ireland so is not governed by UK law.
I have no knowledge of Irish or EU labor and employment law so I cannot offer an opinion as to this particular case.