see if it comes because sometimes your hormones and get knocked off balance and if it doesn't come go see a obgyn to see whats going on hope this helped
Just wait...she'll come around. Stress, a lot of sexual activity, or a lot of regular physical activity can delay it. Starting a new medication or birth control can also delay it. Sometimes it just becomes irregular. For me, having an abnormal period has always been normal. I think it came like clockwork for maybe 6 months out of the 20 years I've had it.