This is an open forum, not Adobe support... I deleted your duplicate message
>sister downloaded CC, but with an email that doesn't exist
As far as I know, the only think you can do is COMPLETELY remove all traces of the Cloud and start over with a real account... and a sister who has been told not to use fake information
-http://helpx.adobe.com/creative-cloud/help/install-apps.html (and uninstall)
-using the cleaner after uninstalling and before reinstalling will usually help
-http://helpx.adobe.com/creative-suite/kb/cs5-cleaner-tool-installation-problems.html