New answers tagged bug
Make a group called Pages view group and app all users to this group. Give this group read permissions to your master page and css file in sharepoint designer
Have you tried adding her to the Site Owners group for the collection? That would give her Full Control rights over the site without giving her access to the site admin settings. If you haven't yet then give it a try. If she still can't see the site collections with Full Control permissions then I suggest you check which pages and lists she can and can't ...
finally it turned out, that the following caused the problem: the structure of the site collection its contained libraries was created semi-automatically by Windows PowerShell scripts and some settings were not set correctly and lead to that problem
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