Add new user with Full Admin rights
It has been a while and I have forgotten the fine details but I remember I had to go to a number of places to expand her permissions to allow her the same full access that I have. I would prefer not to have to leave the simple permissions option to do this to keep things less complicated as the website is very simple with regard to user permissions - just her and I with global rights.
Once you have added her as a user, (whilst still on the 'Edit User' page)- you can choose to 'Add Group' -> Add 'Administrator' -> 'Update User' and you're done. She will now have the same admin rights as you.
As best as I can understand, the only difference is that only I as the initial user in the site, (maybe called the Super User or Super Admin), can login as another user when logged in as myself. Otherwise, it looks like there may be no difference.
Anyone else know any differences?