Should I co-sign on a car loan for my adult child?

My daughter is 20 and has been working as a dietary aid in the hospital cafeteria for two years, part time! We have begged her to get into college, so that she could one day SUPPORT herself. But, she refuses because she doesn't know what INTERESTS her yet! Now she wants me to co-sign on a 5,900 car...I talked them down to 4,750..but, the payments are 162 a month and the car has NO warranty. I want to buy a house but this probably won't that any since I will have this loan out for 3 years with her. What would you guys do?? Her old car just needs the power steering fixed but she is sick of fixing pieces and parts on her car constantly. If she gets this car she will probably work full time and she will NEVER get into school.....hmmmmm