I don't think it would hurt to give the administrator a phone call just to make sure that your job is still in the works. You haven't spoken to her since April and it's now late May. Yes, things may be winding down at school but one never knows when unexpected events may occur. Administrators resign. Paperwork is misplaced. The person you're replacing may have decided to not leave. It wouldn't hurt to call. A single call after about a month isn't pushy. Pushy is showing up at the school every day to ask about your job while also sending 5-6 e-mails and leaving several phone messages.