I'm not sure how many companies are actively offering coverage for Turo, but I do know they have a sponsorship with Liberty Mutual that allows hosts to choose a protection plan. This protection plan covers liability and physical damage to the vehicle, but hosts can also deny a plan if they have their own coverage.
In short, a non-owners policy is for someone who doesn't drive a vehicle on a normal basis, doesn't own a vehicle, and doesn't have access to one. So if your daughter only rents cars, then non-owners insurance may be a better fit.
We have an article that breaks down the insurance score here. In short, a high insurability score means insurance companies should be very competitive in rates and you are an ideal — or "preferred" — customer.