Well, Cameron and Darci are about to set off and do some exploring, and the invitation was open to all.  Additionally, she could strike up a conversation with someone else or just wait until the time skip to the Great Hall for dinner (likely in a few days, maybe sooner).<br/><br/>Of course, anything is open.  She could explore the school on her own, hit up the Forbidden Forest, seek out a teacher, or anything else that strikes her fancy.