You lose.

You put up a good fight, defending yourself with the shaft of the broom against her relentless strikes. However it quickly becomes clear that she's just toying with you and everytime you try to retaliate she simply steps out of the way of your wild swings. Eventually she charges you and you manage to catch her off guard by attacking instead of blocking and you hit her with the wooden handle as hard as you can. The handle simply breaks in half, leaving her stunned for a few moments but ultimately just makes her angry. The vampire quickly grabs your wrist, twisting it until you're forced to drop what remains of the broom shaft as pain floods your body. She looks about ready to kill you...