It's never too late until I stick the character into the wiki. ;)
EDIT: I'd have to check, but I think it was decided that Academy graduations occurred after a Chunin Exam had started (which would put graduation in October-ish for the current crop). The previous graduating class would've been May-ish.
EDIT2: Ah hah. Mentioned
here. Mid-Oct would be the graduation point, with the previous class graduating mid-May. Chunin Exams would start early-Oct and early-May.
EDIT3: Of course, she could've had a deferred/delayed graduation or early graduation for whatever reason.