Should I buy a separate insurance policy for my 17 year old daughter?

Has your daughter already passed the driving test? Or are you seeking car insurance for her so that you can teach her how to drive?

There are some companies which will allow you to add your daughter onto your car insurance policy but many don't do that because young drivers are higher risks for them. If you change insurer, you might be charged a cancellation fee if you paid your premiums for the full year. So depending how many months cover you've got left, it might not be the more economical alternative.

So let me know what the circumstances are to better understand your situation.