Well, this is not enough data. How much insurance does she need? If her car were totaled, could she walk away from that, or is the loss too catastrophic to bear?
You could start with GEICO and get a quote, then use that to try leveraging another company to offer a better deal, but the certain way to save on insurance is to buy less of it. Most States require some minimum, and that amount varies from state to state, but the question you have to answer first is what kind of risk can she bear herself? To the extent your daughter can bear the risk, insurance is a bad deal; to the extent she cannot, you’d better fess up to the bar.