Hermione Granger was 17 years old at this point and she knew her unique study of the person could only go on for so long because soon she was being sent off to war with the Dark Wizards. Dumbledore was being secretive as always and only telling Harry small things, Dolores was trying to run the school and Ron was still treating her like shit and also trying to get in her pants, the latter being something she definitely would not be allowing to happen.