This is properly a very simple solution and reason for this, but I can't find the reason. For one user she can not change any of the properties to the right, like selecting the unit, item or similar.
I tried to change the users license to a named user license (even through a read-only license should be enough) and also add the user to a user group that for sure can do this, but it still does not work on her account. What can the reason for this be?