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Hello again. The above method had me going roung in circles as she doesn't appear to have set any security questions or a recovery email.
However, I did manage to get hold of her old PC (running Vista!) which had previously logged in to the account. This allowed me to update the recovery email to the emergency one I set up for her. She now has access to all her old emails. While I was in there I turned on sync so she also has access to saved passwords and history etc.