My DD does this every time she is about to cut a tooth, like clockwork. My DS had zero reaction to teething so every kid is different but I would wait her out before you change bedtime. In my world that has never worked and often backfires. You could try 730 or so to start but 8 is pretty late for a lot of kids. Give her a week or two, she may just stop or change her pattern. Good luck, been there!