What happens if your daughter drives your car with your permission but she is not insured as an additional driver on your policy and does not have her own insurance policy?

If she's stopped by the police, whe'll be cited for not having insurance. This means she'd then need to get insurance instantly (see the form SR-22), and report that to the court. Failure to do so can get her license suspended. If she is invovled in an accident with no insurance, the bills will all go to you. More, she will be cited for driviung without insurance (even if she didn't cause the accident). and, in an accident, this doesn't always result in a warning ticket -- sometimes there's a real penalty. I would suggest that, if she's a relatively new driver, you get her attached to your policy, as it'll usually cost less than getting her her own insurance. Your insurance agent can help with this.