Stop doing things for her. Allow her to have to fend for herself; all the while assisting the younger kids. Do this in a kind sprit–but ignore her. Tell her that since she is awants to do nothing for the household, then the household is unable and unavailable to provide sustainability . Provisions are unavailable to capable persons over 12 years old in THIS HOUSE.(When she has no clean clothing and spiders make their home in her clothing, no meals prepared by YOU, no phone or Tablet or other device access, no favorite shampoo or shower soaps—life will be really tough. No 14 year old wants to go to school HUNGRY, LOOKING CRAZY WITH MESSED UP HAIR AND UNABLE TO TEXT THEIR FRIENDS ABOUT IT!!