Can you jump in a Running Martingale My horse is 15hh and I am looking to bye her martingale stop throwing head up when she jumps?

You cannot jump in a running martingale. Running martingales have fixed lengths, and are designed to be used while the horse is trotting and cantering, not jumping.

Consider looking into a Standing Martingale if your horse is throwing her head up while jumping. While similar in design to Running martingales, Standing martingales have a longer length and are designed to accommodate a jumping horse's head range of motion.